Things to consider before buying a new mobile.

Whenever you think to purchase a new mobile, you only consider some basic information like camera, storage, ram etc. But that’s not enough, Before purchasing a new mobile there are lots of things which you need to understand like what is arm cortex, what’s its value or how SAR value is necessary.

Generally no one considers these things, but trust me knowing or learning these things will eventually help you to decide which mobile is exactly suitable for you. So below i’ll try to explain each and every aspect of mobile which will help you to understand every details of what a mobile consist.

Now for obvious reason we know that gsmarena is the best website for comparing mobiles, browsing specifications etc. The real reason behind this is, gsmarena always provide every information regarding a mobile phone.

So on below article i’ll use an exact post written by gsmarena, and try to elaborate each and every detail in a easy way.

Note: This post is quite long and will take more than 30 minutes to read but it will be highly beneficial for you. 

If you think this information is really worth it Continue reading..


So as i said i’ll use an exact post from gsmarena, As one plus 7 pro is trending i’ll upload some screen shots of one plus 7 pro and will explain all the details of what it carries..

Why i picked one plus 7 pro for this article?

The main reason why i picked this phone was One plus 7 pro is a new phone and almost carries everything which a normal phone has sensors, processor camera features, everything. So this will make easy for everyone to understand what your mobile has and what you need more if you want to upgrade your phone.

One more thing all the blue colour words has a redirect link to the source. If you wan’t to understand something in, click on the link it will redirect you to the main page.

So let’s start with network first.




increase mobile network

Network means, things that this device needs to communicate to other networks. Basically a new mobile supports 4 types of technology : GSM / CDMA / HSPA / LTE.

Although above 4 types have different bands and frequencies.

What are bands: Bands are the radio signals sent out by carriers that your mobile connects to make calls and use data.Here if we dig deep, there are 3 technologies, 2g, 3g and 4G. All the technologies have some limited range of bands.


Types of Bands


2G bands supports up to: GSM 850 / 900 / 1800 / 1900 – SIM 1 & SIM 2  and CDMA 800 / 1900 & TD-SCDMA

3G bands supports up to: : 800 / 850 / 900 / 1700(AWS) / 1800 / 1900 / 2100

4G bands supports up to:  LTE band 1(2100), 2(1900), 3(1800), 4(1700/2100), 5(850), 7(2600), 8(900), 12(700), 13(700), 17(700), 18(800), 19(800), 20(800), 25(1900), 26(850), 28(700), 29(700), 32(1500), 34(2000), 38(2600), 39(1900), 40(2300), 41(2500), 66(1700/2100) – Global

GSM- CDMA supports 2G technology.

HSDPA : Supports 3G technology

LTE: Supports 4G technology.

Let’s elaborate these 4 network types of mobile below



  • GSM: GSM stands for Global System for Mobile Communication. It is a digital cellular technology to which is used for transmitting mobile voice and data services.
  • GSM has a ability to carry 64 kbps to 120 Mbps data rates. Previously GSM was the largest used network in mobile industry.
  • GSM uses 2nd Generation technology.

  • CDMACDMA stands for Code Division Multiple Access. It basically sends multiple signals at same time to occupy a single transmission channel.
  • This technology is commonly used in ultra high frequency cellular telephone systems.
  • In India CDMA technology was provided by Reliance communications.
  • Like GSM CDMA also uses 2G technology

  • HSDPA: HSDPA stands for High-speed downlink packet access. The HSDPA  supports 3G technology.
  • HSPA is deployed over the WCDMA network on the same carrier or – for high capacity and high speed solution

  • LTE: LTE stands for Long Term Evolution. The LTE network was firstly introduced in 2004 and is upgrade to 3 GPP system.
  • LTE is an ideal technology to support high data rates for the services such as voice over IP (VOIP), streaming multimedia, videoconferencing or even a high-speed cellular modem.
  • Best feature of LTE is to provide a high data transfer rates with low latency.
  • LTE uses 4G technology.

These details on network, bands, technologies, will help you understand how does your mobile communication works.

Body of mobile


one plus 7 pro mobile body

It consists of 4 things Dimension, weight, Build quality, features.

  • Dimension: Basically dimension means height, width of a mobile, Or we can say what is the inch of mobile.
  • For an example the Dimension of Oneplus 7 pro is 162.6 x 75.9 x 8.8 millimeter and inch wise 6.40 x 2.99 x 0.35.


  • Weight: Weight will indicate how heavy or lose does your mobile weigh. On an average a mobile with 5 – 7 inch has a weights between 150 G to 250 G.  Here G indicates Grams.

  • Build: This will include details on what materials a mobile is build. Example front back glass, side aluminium frame, gorilla glass etc.

  • Structure of Sim Card: This will tell you, if the device supports single sim, dual sim, dual nano sim, dual standby etc.
  • Dual sim: Dual sim means,  You can use two sim cards in one mobile.
  • Dual Standby means both the sim slots will support 4G network simultaneously.
  • Nano sim: Nano sim card has a small size compared to normal sim card.



mobile display

Display is divided into 4 parts, Type, size, Resolution and Protection etc.


  •  There are many types of mobile display available in market some of them are
  • LCD (Liquid Crystal Display)
  • OLED (Organic Light Emitting Diodes)
  • AMOLED (Active-matrix organic light-emitting diode)
  •  Super AMOLED
  • TFT (Thin film transistor)
  • IPS (In-plane switching)

Mostly in mobiles IPS display and AMOLED display are highly used.


As mentioned in dimension, size column will display details on what is the size of mobile.


PPI stands Pixel per inch, For better understanding let me give you one example,

Consider a image on two mobiles, Oneplus 1 and Oneplus 7 pro , Here Oneplus 1 has a ppi of 401 and Oneplus 7 pro has a 516 ppi.

Now open a same image and try to zoom it fully, You’ll notice that Oneplus 7 has a clear pixels while zooming rather than oneplus 1. In short higher the ppi more clear the image.


  • As technology increased display too got upgraded, When a mobile falls there are many chances display might get damaged, so companies came with a new protection named gorilla glass protection.
  • For better understanding we can say that it’s a type of coating which is applied on a display to prevent damages.
  • There are lots of version for gorilla glass. Gorilla glass 1, Gorilla glass 2 etc.
  • The latest one is gorilla glass 5.
  • Most of the mobiles in range of 15K and above uses gorilla glass technology in their mobile.

Display part of mobile is completed now let’s check main content which is hardware, Operating system and many more.




Platform basically consist of 4 things OS (Operating system), chipset, CPU (Central processing unit) and GPU (Graphic processing unit)

Let’s understand every aspect one by one.

OS (Operating system)

If explained in easy way, we can say Operating system is heart of a machine, whether it may be a mobile, computer, a micro controller every machine needs a operating system to run some task. Also applications are made in such a way that they are suitable to run in installed operating system. 

In a same way mobiles too need Operating system to work

Like Windows, Linux, Ubuntu, Android are all types of operating system

In mobile Android 2.3.6 (Gingerbread) was the oldest and most used operating system between 2012 -13. As technology upgraded Operating system got upgraded. Currently Android OS 9.0 is the latest named as PIE. Companies like Oneplus use their own OS named as Oxygen OS


 The chipset is on the motherboard and handles its features and the communication between all components. It divides the memory as per it’s usage. Qualcomm, Mediatek develop mobile processors. Every processor has its own version for example: Qualcomm snapdragon 650.

(TIP: A mobile which has  a snapdragon processor above 600 is able to quick charge your device, If your company allows it.. )

CPU also known as processor cores

This is a most important part and probably your speed of a mobile, lag, everything is handled by CPU, Now as this vast topic i Cannot try to explain it via writing so I’ve decided to upload a similar video which will give you and exact answer on what is a CPU of a mobile (processor) and how its useful. Check the video below for better understanding

GPU (Graphic processing unit)

In simple words we can say GPU works like a graphic card in mobile, Higher the adreno more the images and animation will load smoothly and quickly. Although high end games like pubg, fortnite require high GPU to play smoothly.

As in computer we say it as a graphic card, In mobile we name it with Adreno. Adreno has its own version, and for the current time Adreno 640 is the best version available in market.

That’s it here we complete the details on platform now let’s check more information on Memory (Storage, ram) etc.




Memory is divided in many parts when it comes for mobile like  System allocated memory which cannot be modified, Usable memory, RAM (Random Access Memory) and External memory etc.

Now let’s elaborate all of the above one by one

System memory in mobile: Whenever you buy a mobile phone with an internal storage of 32 GB (Gigabyte) there is some space automatically allotted for system. Although it is necessary, because your whole Operating system, root files are stored it it. Legally you cannot modify, rewrite or delete this memory or files present in it. And there are some genuine reasons for it, When a Os is been installed on a mobile it’s necessary that all the device drivers must load correctly on time. There must be no boot failures on a system restart.

Can System memory be modified ? : Legally no but Illegally yes, Once you unlock your boot loader you have every access on system files. You can edit, modify etc. Unlocking you boot loader breaks the security in mobile and let’s user access everything.

(Tip: Unlocking your mobile or rooting your device can make your data unsafe)

Usable memory (Internal storage)

Previously the internal storage provided was very low compared to now, as the use of data is so high that even for some user 64 GB is not enough. In 64 GB mobile, we hardly get 52 GB storage.

This storage is rewritable, we can store any thing, any type of file etc.

Nowadays Samsung is developing 1 TB (Terra byte) of storage. 1 TB = 1024 GB.

 RAM (Random Access Memory)

When a application is running a ram provides memory to the application, Every application needs suitable amount of memory to process if your device doesn’t provide that memory you app won’t run properly.

Ram is also used to save your running applications to run in background. Higher the amount of ram more application you can access at same time.

Features like multitasking, applications switch works through ram.

Even if you wan’t to play a high end game, you need to provide enough memory to the desired application so it can run better.

Like system, Ram is also a fix memory it cannot be changed or modified in mobile.

If you’re thinking to purchase a mobile in future i recommended you to buy mobile with a minimum ram of 6 GB it will also help you to run high end apps in future.

(Tip: You need to clean your ram regularly by removing application from task bar.)


CARD SLOT (External memory card)

You can install a extra memory card in your mobile if you want more space. One more thing, every mobile has its own limit to install external SD (secure digital) card.

For example in above image you can see, There is no slot available. But if you have an extra slot in your mobile. It will have a limit of external SD card support upto 128 GB or 256 GB.

So these were some points on storage, Now let’s check Our most preferred thing Camera.


mobile camera

Here in the image above, The Main camera means Rear Camera some people also say it(Back Camera) and Selfie camera is named as Front Camera.

According to me the evolution of camera has been drastically changed between past three years. Previously there was only one camera at rear that too of 8 Mega Pixel.

But nowadays  companies provide 3 cameras at rear, 2 cameras at front. So i’ll try to explain what does these extra cameras do in your mobile.

Rear Camera

  • A single camera will normally shoot pics as per normal effects.
  • A Double camera will be used simultaneously, As one will click picture and other one will try to focus on character and blur the background automatically. This is called as (Portrait mode )
  • A triple camera will do the 2 things above mentioned but will also use ultra wide technology which place your camera more back than its actual position. In short it will help you to capture more things rather than adjusting yourself for proper photo.

Now As the camera works, there are lots of features working in background for example: HDR, PDAF, LASER Auto focus, OIS, 3x Zoom and many more depending upon your mobile.

So you can check on YouTube how each sensor works.

Selfie Camera 

AS Rear Camera in heavy devices selfie camera is not that complicated. It’s very simple to understand. Old phone used to have on screen selfie camera, but nowadays pop camera has been introduced. Due to this features you won’t have any cutout on your mobile. Rather than you can enjoy a full screen display without any disturbance.

Selfie camera mostly has one camera packed with many features.

Higher the camera more the clear images will be produced.


AI (Artificial intelligence) in camera

You may have seen how camera detects our age, gender, if a object is a dog, furniture or anything etc. Camera detects it, this is possible all because of AI.

How does AI works to identify a dog? : Basically a dog is placed and picture is taken from every side also the shape size height of the dog every data is been generated and then researched.

Once they found out every possibilities that if this or any object is placed if it’s a dog the camera will focus on basic details and blur the rest. So this way lots of research is done to identify a particular object in AI. Not only this AI also learn from its mistakes.

Now for deep understanding you need to check this video for AI cameras.

(TIP: According to me Oppo- Vivo have best cameras rather than other companies)

Video Recording

Video recording in a mobile is useful for both the camera, you can record videos with rear and front camera.

But mostly rear cameras have good image detail rather than selfie camera. Also fps plays an important role while playing a video.


What is FPS?  FPS stands for frames per second, It means how many frames generate per second for the video. Now there are lot’s of types in fps for example video will record at 1080 P(pixels) with 30 fps, 60 fps, 120 fps and many more.

Now the fps plays a important role here. For better understanding higher the fps more smooth and realistic videos will be.

If you wan’t to experience it Search on YouTube for 60 fps video and play it with 1080P resolution and after watching the video play the same video in 480P resolution.

You’ll understand major difference here.

So if you found a camera with a recording of 1920*1080 60 fps, trust me you’re going to enjoy the quality of video.

NOTE: Shooting videos in 60 fps will take more memory rather than a normal HD video.


mobile sound
  • I don’t think you need a understanding thing for sound as loudspeaker and 3.5 mm headphone jack is present mostly in all device except some variants of i phone.
  • Now a days some companies provide a USB OTG (OVER THE GO) converter through which you can plug that cable in your charging port and on other hand you can connect your earphones in it.
  • One more thing Active noise cancellation is available on every phones. Active noise cancellation cuts extra noise from your surrounding and focuses on closer voice to device
  • For clear understanding: While in a traffic, if you get a call from a friend he would only listen your voice rather than a horn or vehicle noise. The ratio is 80-20.

TIP : There are earphones available too with noise cancellation feature (Good for playing pubg :P)

  • Dolby Atmos provides a realistic sound compared to normal speakers. Recently in the year of 2017-2019 many companies provide Dolby Atmos for better sound quality.
  • That’s all for sound now let’s head toward communication section.

Mobile network

  • Communication has a good impact on overall phone. Feature like NFC are now been provided by every company. Previously only Sony used to provide this feature on their Top range phones.
  • Communication basically includes WI-FI, Bluetooth, GPS, NFC, RADIO, USB.

Let’s understand all the details one by one below:

WLAN (Wireless Local Area Network)

Now we all maybe familiar with usage of wi-fi as it’s easily available everywhere. Airport, Station, MC Donald’s, and at many other places. But what does the number 802.11 a/b/g/n/ac means ?

Wifi 802.11 a is an IEEE standard for transmitting data over a wireless network. We can also say a/b/g/n/ac are the different versions of it. Every versions has it’s own benefit for example:

  • 802.11/a uses 5 GHz frequency of data band and supports speed of 54 Mbps (megabit) or 6.5 (megabyte) per seconds.
  • 802.11/b only supports a data transfer rate of 11 Mbps.
  • A 802.11/g only supports a data transfer of 54 Mbps but uses 2.4 GHz.
  • The 802.11/n uses both 2.5 GHz and 5 GHz frequency bands.
  • And 802.11/ac is the latest version developed in 2016. It works on 5 GHz bands and has a transfer speed upto least 1 gigabit per second (1 G bit/s) and single-link throughput of at least 500 megabits per second (0.5 G bit/s)

Now if any mobile has a single criteria or we can say a single version just understand it will support the router which has same version listed in your mobile. (All the routers made today at least support 802.11 a,b,g so you don’t need to worry.)

What is dual band Wi-Fi ?

Basically dual band Wi-Fi allows to function both 2.5 GHz and 5 GHz in your mobile. As single band is mostly used in every mobile but it reduces the speed or limits the speed till 50 Mbps because it only supports 2.5 GHz , but a dual band supports both 2.5 GHz and 5 GHz so if you’re using Jio Gigafiber and have a top speed upto 500 Mbps your mobile will utilize the whole speed.

What is Wi-Fi direct:

Wi-Fi is called Wi-Fi P2P(Peer to Peer) connection. Here 2 device can connect to each other without any internet access. Wi-Fi direct is compatible will all modern smart phones. All you need to do is go to your settings, head toward Wi-Fi select Wi-Fi direct turn it on on both device and pair it like a Bluetooth.

Now when 2 devices are connected to each other, both of them can send files directly. Also Wi-Fi direct has a good transfer rate rather than Bluetooth.

Simple example: Applications like Flash Transfer, Software data cable uses this technology.

DLNA  (‘Digital Living Network Alliance’)

DLNA: DLNA is an industry-wide standard for sharing data over a home network. Through this you can stream videos from your laptop to TV, print your documents from laptop to printer without connection.

What is a Hotspot:  You can share your internet to your friends mobile via hotspot.  All you need to do is head towards your mobile settings, click on Wi-Fi settings, find turn on portable hotspot and turn on your mobile data.

Once your friend enter correct credentials he can use his internet on your phone.

Nowadays even Wifi routers can become a hostpot.

check this one.


Today Bluetooth is today used everywhere, sending files, connecting to smart watches, listening songs on Bluetooth headsets etc. The current version of Bluetooth is 5.0. Although it’s latest and has various improvements rather than 4.0. Still if you’ve a 4.0 Bluetooth device and wan’t to connect to version 5, you can pair it.

How to turn on Bluetooth? 

Open your mobile settings, head towards Bluetooth, click to turn on and search for desired devices. Once you find your device click on it and select pair.


GPS (Global positioning system)

GPS is used to find a location whether it may be Mumbai or America you can find every road, railway tracks here. There are some applications made for GPS such as Google maps, Waze and Sygic etc. Also through GPS you can track your friends or any device by sharing live location. This feature was introduced in the year 2018.

There are two frequency bands used in GPS

  • Single frequency band
  • Dual frequency band

There are 3 types of frequency band L1, L2, L5

The one which uses only L1 frequency band are called as Single band

And the one which uses L1+ L2, L2+ L5 are called as Dual Band.

Now for full explanation you need to refer this blog. 

There are 4 types of navigation system which are explained below:

  • Glonass: provides a civilian radio navigation-satellite service
  • Galileo: Here the receivers will be able to combine the signals from both Galileo and GPS satellites to greatly increase the accuracy.
  • (SBAS) support wide-area or regional augmentation through the use of additional satellite-broadcast messages. Using measurements from the ground stations, correction messages are created and sent to one or more satellites for broadcast to end users as differential signal
  • BDS : BDS is divided into two parts, the original one (BeiDou) using geosynchronous satellites to provide coverage in Asia, and a next-generation one (BDS) using medium-earth-orbit satellites (as does GPS) to provide global coverage.


NFC (Near field communication)

Mostly used for transactions or payments through smartphones. We can also used NFC to send and receive files. I still remember Sony phones had NFC way to before then now. With just a tap you could send files.

As the name suggest Near field communication, it works on small distance like between 4 cm, if you move your device from it’s limit, connection is lost.

The communication process is fast and consumes less battery as compared to Bluetooth.

Not only file sharing, electronic tags, make payments are some features of NFC.


As we all know what a radio is and how does it work. You need to change the station according to it’s value and then you can here content aired on that network.

Nowadays radio is not so active or used as compared to previous days.

USB (Universal serial bus)

When it comes to charge your device, listen music via converter, transfer your files to another device like Computer. USB helps us a lot.

Previously phones used to have 2.0 micro USB data cable which is still being used in today’s phones. But company like apple already provided USB type C cable for its use.

Micro USB has a low transfer speed rather than type C 3.1. Also the quality is much better compared to micro USB cable.

The one major advantage of USB Type-C cable is you can plug it from any direction.


You can read whole history on USB cables here.


mobile fingerprint scanner

Fingerprint scanner : It is used to unlock your phone with a fingerprint. Also some phones have placed their fingerprint sensor on display.

Accelerometer : The auto rotate feature works through accelerometer sensor. Also when you flip your phone and your phone gets silent this is also done by accelerometer sensor.

Gyro sensor: No matter how you handle your phone, gyro sensor will detect it easily. For best example we can say while playing pubg you can tilt your phone to change direction of your aim. This is possible because of gyro sensor.

proximity sensor: Turns your display On-Off on a call when you place it near your ear. Basically it’s programmed in such a way if a light blocks between defined radius it will turn of display or vice versa. Now a days pocket gesture also uses proximity sensor.

Compass: This sensor is used to detect your position, whether you are in north, south, east or west.


one plus 7 battery

Battery are non removable and mostly built above 3000 mAh (mili amp hour). A normal 3000 mAh battery can easily last upto 1 day if your UI is not heavy and  filled with less bloatware.

In 2016 fast charging technology version was 2.0 Quick charge but in 2017 the companies introduced quick charge 3.0. Basically 2.0 will charge a 4000 mAh battery in 2 hours 30 mins. While a 3.0 quick charge will charge your device within 1 hour.

As i said earlier that you’re investing a amount on a phone so why not pick a best phone.

That’s it i really think this blog will help you in some way or another, but if you genuinely like the blog do comment it encourages me to write more useful content.

Note: The videos and the redirect links to the blogs are just used as an reference, Blogsbarrel doesn’t promote any of the above things. 

Credit for uploaded images goes to gsmarena official website. I don’t claim any rights to them. 

If you found something wrong do let me know in the comment section below.

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