Fast Charging : Quick Charge, Dash Charge,and Supercharge Explained

Smartphones are getting slimmer with the time and it is not easy to place the larger battery inside these phones. So, the manufacturers stopped thinking about placing the big battery and worked on its alternative which is charging speed, so that the smartphone stay topped up the whole day.  

Today, a lot of smartphones comes with fast charging and all of them indicates a different name for it. Majority of the devices use Qualcomm's Quick Charge standards for fast charging but there are some other players who have implemented their own fast charging technology such as Oppo's VOOC charging commonly called as dash charge in Oneplus devices and Huawei's SuperCharge.

In this post, I will be talking about the working of fast charging and implementation of different fast charging techniques, breath in and let's jump right into it.  

How Fast Charging Works?

In general, smartphone batteries charges with the current passing through them. Batteries charge faster with a greater value of current and voltages but there is a limit to what they can take up. Here the charge control ICs plays an important role in preventing dangerous spikes in current which may affect the battery.

Power (Watt) = Current (Amp) * Voltage (Volt)

Fast charging directly depends upon the power (Product of current and voltage). So, some manufacturers achieve fast charging by high voltages - low current and some get it by implementing low voltages - high current.

Qualcomm Quick Charge

Quick Charge achieves the fast charging by increasing the voltages and which increases the overall wattage or power.

There is a series of Quick Charge Standards available in the market but the Quick Charge 3.0 is most widely used in the smartphones. 

Quick Charge 1.0 operates at 5V/2A with a maximum power of 10 Watt which can charge your phone slightly faster than normal charging.

Quick Charge 2.0 operates at 5V/9V/12V / 1.67A/2A with a maximum power of 18 Watt which can charge your device faster. 

Quick Charge 3.0 and Quick Charge 4+. In Quick Charge 3.0, voltage range is 3.6V minimum and 20V  maximum and INOV (Intelligent Negotiation for Optimum Voltage) decides the increment and decrement according to the battery status. 

For example, if your device is at 10-15% then power delivered to the battery will be high and if the battery is at 80 to 90 percent charged then the supplied voltage and current will be lowered to compensate the thermal temperature of the battery.

Charging Speed

The Quick charge 4+ is claims to provide 5 hours of battery life in just 5 minutes of charging. It can charge up to 50% in just 15 minutes. While Quick charge 3.0 can charge up to 55% in 30 minutes considering battery size to 3350 mAh (reference device Xiaomi mi6).

Oneplus Dash Charge

Dash charge is another name for VOOC (Voltage Open Loop Multi-step Constant-Current Charging) fast charging standard patent by Oppo which is the parent company of Oneplus.

Unlike the Qualcomm Quick charge, Oneplus increases the current magnitude to achieve fast charging. It operates at 5V and 4Amp which provides a maximum power of 20 Watt. The electric current is more evenly distributed at higher levels with the use of high current value. A dedicated chip or microcontroller controls the voltage and current to be supplied to the phone which is placed in wall charger itself. 

Dash charge works only when the supplied wall charger is used to charge the Oneplus devices and will not work with any other fast charger. The wall charger itself controls the flow of the current through the charging cable to the battery by continuously monitoring the charge level of the battery.

Charging Speed

Oneplus' Dash Charge claims to charge up to 65 % in just 30 minutes (reference device is Oneplus 5T having 3300 mAh battery). It can charge the device from 2% to 100% in 1 hour and 14 minutes which looks awesome when compared to normal charging (5V/1Amp).

Huawei SuperCharge

SuperCharge is the proprietary charging standard of Chinese smartphone maker Huawei. The SuperCharge compatible wall and car charger support three charging modes which are as follows:

• 5V at 2Amp
• 4.5V at 5Amp
• 5V at 4.5Amp

It provides a maximum power of 22.5 Watt which is greater than Dash Charge and Quick Charge 3.0. 

These three modes are switched in-between automatically by monitoring the battery status and phone's temperature. The wall charger's built-in chip is used to regulate the voltage and current which eliminates the heating that may occur if the voltage regulation is done within the phone.

Every SuperCharge compatible device can take advantage of Quick Charge charger because of the presence of Super Smart Protocol which intelligently switches between the modes according to the cable and charger connected to the device.

It utilizes the 8 layer cooling system and special lining to keep the smartphone up to 5 degrees cooler than other fast charging standards.

Charging Speed

Huawei doesn't mention about the charging estimation for SuperCharge but some reviewer has done the charging test which shows that it can charge from 2% to 100% in 1 hour and 18 minutes considering the battery size of 3750 mAh (Reference device Huawei Honor View 10). It is faster than any proprietary fast charging standard considering the battery size.

Author's Recommendations :

• Various Smartphone Sensors and what you should know about them?

• Smartphone Camera: Megapixel, Sensor Size, and Aperture Explained

• How OIS and EIS - Image Stabilization Works? Explained

• How Does Vivo X20's Fingerprint Sensor Works? : Tech Behind it.

Various Smartphone Sensors & What You Should Know About Them?

Whenever you are buying a smartphone, most of the users may actually figure out what is the processor used and maybe how much RAM and storage it has but they rarely figure out what are the sensors which are present on the smartphone. 
Trust me, it is very important to know what kind of sensor your smartphone has because the functionality of the phone will depend on the sensors it has.   

In this blog, I am going to talk about various sensors. You will find almost all the sensors on a high-end smartphone but in mid-range and budget segment, the manufacturer tends to skip most of the sensors.

Proximity Sensor

This is the most common sensor which is present on every smartphone starting from the entry level to the high-end flagships. It is generally placed close to the earpiece. 
The thing that it does is that it blackouts the screen when we bring the smartphone near the ears.

Actually, it senses when the body is in the close proximity and then turn off the screen to prevent the accidental touches while taking calls.

Ambient Light Sensor

It measures the light intensity around the smartphone and changes the screen brightness accordingly. For an example, if you move outdoors in direct sunlight then it boosts the brightness of the display and again if you move indoors in low lighting condition or at night it decreases the brightness so that it won't hurt your eyes. It does this thing automatically and hence it is also called as an auto-brightness sensor.

The main purpose of the ambient light sensor is to decrease the battery consumption and to provide better viewing in diverse lighting conditions. Mostly all the smartphones have it but some mid-range devices skip this, such as Samsung ON 7 Prime which does not have it. 
The Lux is the unit for illuminance and hence sometimes it is also called as LUX sensor.

Accelerometer Sensor

It measures the speed of the movement on the phone, for an example, if you rotate your phone from portrait to landscape then the screen changes its orientation accordingly this is due to the accelerometer.
The games like Temple Run and Subway Surfers is totally based on this sensor where you tilt your phone to move the character in it.
This is generally found on every device out there in the market.

Pedometer Sensor

Generally, this sensor is not found on most of the devices. It detects the footstep count of the person holding the phone. This can be useful if wish to stay healthy by monitoring your daily steps count. This is not the must-have sensor but if it is present then it is good. It is found on Huawei and Honor devices.     

Gyroscope sensor

This will be an important sensor if you want to enjoy virtual reality, augmented reality and the 360-degrees video on your smartphone.With the gyroscope sensor, the smartphone will know the x, y, and z-axis, for example, while watching a 360-degree video if you move your smartphone to left, right, up and down, then with the help of this sensor, the content will be shifted accordingly. 

Unlike the accelerometer, it measures the angular movement of the smartphone while accelerometer measures the linear movement. 

It also helps in image stabilization.

Barometer Sensor

It measures the altitude of the place where the smartphone is present. Basically, it assists the GPS chip inside the smartphone to get a faster lock by providing instant altitude data. It can help to provide the "floors climbed" data to phone's health app.

Compass Sensor

It is also called as the magnetometer and it can detect the earth magnetic field at any point where the smartphone is.

The data from magnetometer and accelerometer together determine which way is North and which way is South. It also helps in the automatic rotation of the map in the Navigation apps like Google Maps.

GPS(Global Positioning System)

GPS is not a sensor, it is a chip which is present on every smartphone out there in the market. There is two navigation system one is standard GPS owned by the United States and other is GLONASS navigation owned by Russian Government.

Standard GPS chip is generally found on every phone and it gets the job done but for more accurate positioning the manufacturers are using both the chips for standard GPS and GLONASS.

Fingerprint Sensor

There is mainly three type of fingerprint sensor namely optical, capacitive, and ultrasonic sensor. Most of the phones have the capacitive sensor. This scanner or sensor has an array of charged capacitors and the charge stored in the capacitor will be slightly changed when your finger's ridges placed over conductive plates, while valleys having air gap will leave the charge unchanged, hence a unique pattern is recorded which will be utilized for future login verifications.

Fingerprint sensor can be mapped to different gestures like swiping up or down and press & hold to perform some tasks such as taking calls, clicking photos, browsing gallery, and much more. This type of functionality is provided on certain phones like Honor, Xiaomi, and Google Pixel 2 etc.

"If you have any questions or suggestions then leave them in the comment section below. I'll get back to you."

Smartphone camera: Megapixel, Sensor size, and Aperture Explained

When we talk about the camera, the megapixel count is the first thing that comes to our mind.
We often decide the quality of the camera by its megapixel count, for an instance a normal person will choose a 20 MP camera over a 12 MP one because what he knows is that greater the megapixels, better the camera quality but it is not how the things works. 
There are other parameters such as sensor size, aperture, and image processing which decide the camera quality along with megapixels.

Let's find out, how these parameters add to the image quality of a camera. 

Megapixel Count

Most of us believe that higher megapixel camera takes a better quality image than the lower megapixel camera. Megapixel count tells about the number of pixels present in the image.
The pictures taken with the higher megapixel camera will have a higher resolution and you can zoom in a lot more without the picture being pixelated as compare to lowers megapixel camera. But there is no such significant difference in the quality of images from both the cameras.

Let's understand why megapixel count does not necessarily improve the camera performance.
Suppose we have two cameras, one of 12MP and other is 20 MP and if the sensor size is same then in 20MP camera the individual pixel size will be small and being large in number they will be cramped into the sensor due to which interference will take place between adjacent pixels, hence the overall image quality will be affected while this will not happen in 12MP camera as there are fewer number of pixels present in the same size sensor. 

A 12 MP camera will provide a resolution of 4200*2800 and can print a picture size 16*24 which is more than enough for a smartphone camera considering its sensor size which is small as compared to DSLRs. Going beyond this does not improve the image quality, actually, it does the opposite.

Most of the flagship smartphone from top brand houses a 12 MP camera with large sensor size, larger aperture, good optics, and better image processing.

Sensor Size

The sensor is the core part of the camera and it is responsible for the conversion of optical light into the digital signals or photos.

Greater the sensor size, better the quality of the image captured. For an example, if the sensor size remains constant and the megapixels are increased then the individual pixel size will be different for the different megapixel count. A 12 MP camera will have larger pixel size and a 20 MP camera will have smaller pixel size.
Greater the pixel size more the light they capture and hence sharper the image captured will be.

Sensor Size

Here we can conclude that sensor size should be big enough so that the individual pixel size is not too small. The pixel size should be at least 1.25 micron and if it is greater than that it is better.

The Google Pixel 2 & Pixel 2 XL comes with a pixel size of 1.4 microns and we can see the results are just amazing whether it is photos or videos.

Camera Aperture 

Aperture is the opening of the camera lens through which light enters the camera body. Larger the aperture, the more light will passes through the lens and reaches the sensor.
The aperture also controls the "depth of field" and which varies with the aperture.
The depth of field, in which the subject is kept in focus and the background remains defocused producing Bokeh effect or Shallow depth of field.

Larger the aperture, greater the depth of field. Aperture is generally expressed as "f/number", smaller the number larger the aperture.
Large aperture helps in capturing low light photos with less noise as compared to small aperture lenses.

Aperture Size

Most of the mid-range and the budget smartphones have f/2.2 to f/2.0 which offers a decent amount of sharpness in the image.
Most of the flagships have larger aperture such as LG V30 has f/1.6, Samsung Galaxy Note 8 has f/1.7 and Google Pixel 2 has f/1.8 which make these smartphones to perform better in the low-light scenario.

Image Processing

Image processing plays an important role in the overall camera performance. Suppose the two cameras have the same sensor, sensor size, and the aperture but we still see a certain difference in their end results, this is because they both use different image processing techniques. Image processing can make the image to look nice even if the camera hardware is not that great.

For example, last year's Google Pixel used the Sony IMX378 sensor and it was used by Xiaomi in MI5S but one can notice the difference in the images they produce. Google's image processing simply outperforms the Xiaomi's image processing by producing better results.

If you have any question or suggestion then leave them in the comment section below. I'll get back to you.

How OIS and EIS -Image Stabilization Works? Explained

We all love to take photos and videos with our smartphone and sometimes when our hands are not still or the background is dimly lit while taking photos or videos then the captured results come out to be blurry & shaky which totally ruins the moment you wanted to capture.

In this scenario, the Image Stabilization techniques such as Optical Image Stabilization and Electronic Image Stabilization plays an important role in providing the end result stable.
Both OIS and EIS are completely different on the basis of their implementation but they both do the same job of stabilizing the photos and videos.

Optical Image Stabilization (OIS)

It is obvious when your camera's shutter speed is high then it opens and closes very fast, which reduces the time to hold your device steady to capture something. However, if your shutter speed is low for example if you are shooting in poor lighting condition then you need to keep your hands steady for a longer period of time and if your hand moves a little bit then your end result may be blurred.

This blurring caused due to movement of hands or sudden quakes during filming video is compensated by OIS technique.

It requires hardware to counteract the movement of the phone while taking snaps or videos. It uses an assembly of floating lens, gyro-sensor and a motor accompanied by a microcontroller to control the movement of the floating lens.

It keeps the track of the phone movement by using the data from gyro-sensor, this data is then sent to the microcontroller chip which decides the movement of the floating lens. For example, if the device is moved toward right then the lens will move toward the left to offset the device movement and hence the footage comes out to be more stable from a phone having OIS than a phone without stabilization.

All these things such as data retrieving from gyro-sensor then sending to the microcontroller and the movement of the floating lens happens before the image hit the CCD (Charged Coupled Device) and hence we do not degrade the quality of the footage.
The Nokia Lumia 920 was the first smartphone to have OIS support and now flagships from top brands like Apple, Samsung, Google, and LG etc., offers the same.

Pros 

It reduces the shakes in the video and negates the blurriness in the pictures taken. It increases the image quality of the footage shot.

Cons

• OIS assembly increases the size of the camera module which affects the sleekness of the smartphone. Camera hump is often seen on the phones having OIS.
• OIS is found on High-End smartphones because it adds a lot to the cost of the device and makes the phones bit pricey.
• It can not be upgraded with the software updates, you have to get it replaced.

Electronic Image Stabilization (EIS)

This technique is completely different from the previous one as it does not require any kind of hardware for its implementation.

Most of us edit the videos and photos after we have taken them to make them watchable.

Every camera has CCD (Charged Coupled Device) which is nothing but an array of numerous light sensors arranged in a grid, which captures the optical light and convert it into digital signals.

In this technique, the videos and photos are divided into small chunks or frames and then with the help of algorithms, the processor compares the frames whether the motion in the frame is an object or it is an unwanted movement, then it takes the required action to make the videos and photos stable.
Actually, in EIS the blurred out frames are cropped and then joined together to provide a stable result without degrading the image quality too much.
Most of the phones such as Oneplus 5t, Huawei Honor View 10, and Google Pixel & Pixel XL etc., uses the EIS technique for stabilization.


Pros

• It does not require any hardware component so it can be enabled with OTA update on any smartphone having a Gyro-sensor and a capable processor to hold up the processing.

• It can be upgraded via OTA updates by changing the algorithm.

Cons

• It increases the battery consumption because it uses the processor extensively in post-processing of the image.

• It is supposed to work fine in daylight but in the dimly lit condition it may suffer a bit but if the device has larger camera sensor then it will work fine.

There are some phones such as Google Pixel2 /Pixel 2 XL and LG V30  which uses both EIS and OIS for stabilization, the processor automatically decides where to use OIS and EIS. The OIS performs better in taking still shots and EIS do perform better in videos.



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If you have any questions leave them in the comment section below. I'll get back to you.

How does Vivo X20's Fingerprint Sensor Works? : Tech Behind it.

Most of us were really moved by the rumor about Apple iPhone 10 that "it will have fingerprint sensor underneath the display which will provide a complete bezel-less design and become the only one of its kind" back in 2017.

But the Ace smartphone manufacturer Apple couldn't manage to do it right and skipped it completely and launched it with Face ID.

Then the rumors about Samsung's Galaxy Note 8 was catching fire and people were excited about it but same as the Apple, Samsung failed too.However, unlike the Apple, Samsung didn't skip the traditional fingerprint sensor from the phone which was a great move.

By joining the hands with a computer manufacturing company named Synaptics, Vivo managed to launch a smartphone (Vivo X 20) in CES 2018 which houses an Under-Display Fingerprint Sensor.

Now you might be wondering, how does it work, right? I will tell you all about it in this blog post.

How Does it Work?

It is developed by Synaptics and named as Clear ID FS9500.

It is an optical fingerprint scanner and it works, same as the traditional optical scanners work but with some modification in its implementation.
It is placed behind the OLED panel in Vivo X 20  and it uses the gaps between the pixels of the OLED panel to its advantage and manages to see the user's finger through them.

It takes the image of the finger placed on the screen in very high resolution and contrast than any other regular camera, then the algorithm detects a unique pattern of your finger by analyzing the image thoroughly for the lightest and the darkest part in it. It analyzes the ridges and the valleys of the finger.

Obviously, it is very dark when the finger is placed on the display when the device is locked so these scanners have an array of LEDs to illuminate the finger while taking pictures of the finger.

It automatically detects the presence of the finger near the sensor and light ups the area where you need to put your finger in.

Being optical scanner, it might not be faster than traditional capacitive scanners but it is as faster as the other biometric option such as 3D facial recognition like the one found on Apple iPhone 10 and it is highly secure too.

Limitations:

1) Speed 

• It is not as fast as the capacitive fingerprint scanner but it is not that slow as well, it takes around 0.06 to 0.08 sec to unlock the phone.

2)  Fingerprint Recognition Through any type of protecting glass

• It is supposed to work accurately if the glass's thickness does not increase 1.5mm.
• If it thicker than 1.5 mm then it may misbehave and may not work properly.

Advantages:

• Being placed underneath the display, the sensor will help the manufacturers make their phones bezel-less and customers will get to enjoy a great screen to body ratio in upcoming phones.

•  It can work with wet, dry or cold fingers while the regular scanners won't. 

•  It comes with the anti-spoofing technology called SentryPoint Security Suit.

• A unique characteristic of this sensor is that it has enrolment and match in the sensor itself - completely isolated from the host processor.

• It comes along with other features such as a cryptographic engine on the chip, TLS1.2 encrypted secure communications to the host, a unique key generation module, and FIDO UAF Authenticator.

I hope, now you know how an under-display fingerprint scanner works.

If you have any questions then leave them in the comment section below. I will get back to you.

     

WhatsApp UPI Payment : All You Need To know

WhatsApp has introduced UPI payments features in India.
Now Whatsapp user in India can make payments through their favorite messenger without leaving the conversation with their friends.
Facebook owned-company has rolled out this update for both Android and IOS users.
It was in beta testing for Android and now it's up for everyone out there

Whatsapp isn't the only player in the market that offers UPI based payments, there are many like Hike, Google Tez, PhonePe and Paytm etc., who offers the same.

Being a popular messenger this feature can be hit for Whatsapp.

Whatsapp UPI Payment: How Does it work?

Payment option is not present on every Android smartphone till now, the one who has updated his app has it.

If you are not able this feature in your WhatsApp messenger then update your app to the latest version  ( 2.18.8).

It can be seen in the setting menu of the WhatsApp messenger and can be easily set up.

From the setting, menu tap on Payment

  

After that accept the term and conditions offered by Whatsapp, then verify your number linked to your bank account.

It will send a  message to the bank for the UPI registration and then select the bank and that's it.
Your account is set up and now you can send or receive money from your friends who have created their UPI account on WhatsApp.
 To send money you have open the chat of that friend and click the attachments icon then select  UPI Payment option.
Later, fill the amount to pay and enter UPI pin that's it.

Comparison with Google Tez and Paytm

Google Tez is a complete payment oriented app, it can transfer fund to Tez user, other VPA addresses, bank accounts as well and other bill payment like electricity, DTH, IRCTC and much more.

While Whatsapp can only transfer funds to the WhatsApp users and other  VPA addresses.
Money transfer to a bank account using Account number is not possible in Whatsapp UPI payment option.

Where Paytm is also providing the same functionality as Tez does but at the same time it can be used as the messenger.

Paytm seems to be a complete app than the other two.

How to get UPI Payment Feature in Your WhatsApp

You should get this feature as soon as you update your app to its latest version. Every user is not getting this feature after updating their app, there nothing wrong with your phone or the app so don't worry about it, just ask your friend to pay you through UPI and then you will get this feature in your Whatsapp.




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Buying a Smartphone: Things That You Must Consider

    These days, Smartphones have become an integral part of our lives. We do most of the things with our phone only.

Whether you need a new phone because your old one is choked out or you are a tech geek who frequently switches mobiles to add new technologies to your arsenal.

Availablity of a wide variety of phone in the market, make it difficult for us to pick one of them.
To Select, a device that may suit your need best is a tough task to do. 

Here are 10 things that you must consider before you go for your next smartphone:-

1) Design and Build

The smartphone market mainly uses two types of materials ( Metal and Plastic) for manufacturing their phones.
Though there are some manufacturers who use glass-coated panels, those are very limited.
A phone carved from metal is more durable than a plastic one, it can bear a drop from 2-3 feet of height.

You cannot expect the same from glass coated one as they shatter as soon as they are dropped.
Though a glass coated smartphone looks appealing to eyes but not durable.
Figure out do you want an alluring or a sturdy phone?
I personally like indestructible one, do let me know your liking in the comment section.  

2) Processor

    The processor is the heart of any computing device same goes for the phones.
For a heavy user (the one who do a lot of video editing or plays heavy games like Asphalt 8) then go for the high-end processors like Snapdragon, Exynos (manufactured by Samsung) and to some extent, you can opt for HiSilicon Kirin SOC (made by Huawei).

If you are a casual user and plays some light games like temple run, candy crush saga then a MediaTech chip wouldn't disappoint you either.

3) Display 

    Screen size depends on your usage and preference.
If you often stream videos, edit photos or videos on your device then a 5.5 -6.0 inches display with the resolution of  Full Hd (1920*1080 pixels) or QHD (2560*1440 pixels) can get the job done.
  
If you are a regular user and mainly use the phone for checking emails, chatting, browsing different social media apps then a display of 5-5.5 inches with Hd or Full Hd resolution will be a perfect pick for you.

If you go beyond 6-inch size then the handset seems to feel heavy in hand and also difficult to carry around. 

An IPS LCD panel is better than TFT LCD panel because it has better colors, saturation levels, and viewing angles. Amoled displays far better than IPS panels but costs more than an IPS panel so chose accordingly.

4) Camera

    Most of the people have misconceptions about megapixel count means better the image quality.
The megapixels only determines the number of pixel in the image and it will appear sharper on lower display size and nothing else.

A 12-megapixel camera with a larger aperture(f/2.0 or f/1.7), better image processing can click far better image than a 16 or 20 megapixel with f/2.2 aperture.
Mid-range and budget segment devices lack any type of stabilization in camera hardware.
But keep your eyes wide open if you are buying a flagship handset.

5) Battery

    Battery life relies on the usage if you use your phone for streaming videos, playing games and work on mobile apps then a 3500 mAH battery will be good enough.

If you are a regular user then a 3000 mAh battery will hold up fine.

6) User Interface 

    All interactions with the handset are made via UI then it should be simple and provide a seamless experience.
You can opt for Stock android if you are a stock android lover or you can go for custom UI options like EMUI, MUI, ZenUI and Samsung's TouchWiz etc.

They do provide some extra features that stock Android lacks but at the same time these UIs are heavy.
They may have some bugs in them and these can get fixed by OTA updates. So it's up to you analyze what you like more feature packed or a bug-free stock android OS.

7) Storage and RAM

    A good processor coupled with 4 Gigs of RAM can handle almost all the task thrown at it and it is the best fit for the heavy user.
2-3 Gigs RAM models will be enough for regular users if they have a decent processor.

Storage that is printed on the retail box is not but we get because most part of it is already taken by the preinstalled apps.
If you use a large number of apps on your phone then you can go for 64 or 128 GB models.
If you are a regular user and uses limited apps then you will be fine with 32 GB of storage.

8) Sensors

    A smartphone in 2018 must have necessary sensors like proximity sensor, ambient light sensor, accelerometer, gyroscope, NFC, and GPS etc., in it.

• Proximity sensor helps the phone to turn off the display while you receive a call.
• The ambient light sensor is used for automatic brightness in mobile.
• Gyroscope help in viewing 360 videos.
• NFC helps in contactless payment.

9) Headphone Jack and USB Port

    The phone comes with either micro-USB or USB type -C port for charging. 
But USB type -C seams to more futuristic and it has its advantages as well like fast charging support etc.

Make sure the phone have a headphone jack (3.5mm ) because manufacturers are ditching this from their premium devices line up but the mid-range devices still have it.

I think it is not a good idea to remove  3.5 mm headphone jack from the handset as it has its own pros.
What do you think?

10) Price

    A phone should be chosen depending on your need but do keep in mind it won't burn a hole in your pocket.
The smartphone should justify its price with the features it is offering, make sure you never get fooled by the brands like Oppo and Vivo as their handsets are just overpriced for what they offer.
    
For a budget and mid-range phones, you can check out offerings from OnePlus, Huawei Honor, and Xiaomi.
So, choose a phone that fits your pocket and budget as well.