SAR (Specific Absorption Rate) –
From childhood we are listening HEALTH IS WEALTH, so why should not consider it before buying a cellphone. Nothing important than our body, if any smart phone offering good specifications but SAR is very high then we must think before buying it.
Specific Absorption Rate (SAR) is a measure of the rate at which energy is absorbed by the body when exposed to a mobile phone’s radio frequency electromagnetic field. It is defined as the power absorbed per mass of tissue and has units of watts per kilogram (W/kg). SAR levels for mobile phones sold in the US must not exceed 1.6 W/kg while Europe’s must not exceed 2W/kg over 10g of tissue.
2. Camera Quality –
A smartphone is useless without a good camera. This is the second thing we should must check, also there is two types of camera. Front camera and Rear Camera. Friends time has changed. This is the time of SLFIE front camera has same importance as rear camera. Now question is how to judge about camera quality.
Megapixel – Megapixel means one million pixels. A pixel is one dot of information in a digital photograph. A digital photographs today are made up millions of tiny dots (Mega = Million). The resolution of digital cameras and camera phones is often measured in megapixels. For example, a 5-megapixel camera can produce images with five million total pixels. More megapixels do matter when viewed on a phone, when zooming in or cropping a photo. For example, some phones with 20 or more megapixels let users “zoom in” without losing quality.
In simple term More megapixel means better photography
Auto focus camera – A camera’s autofocus optical system uses a sensor, a control system and a motor or tunable optical element that intelligently adjusts the camera lens to obtain focus on the subject.
HDR – High-dynamic-range imaging (HDRI or HDR) is a set of techniques used in imaging and photography to reproduce a greater dynamic range of luminosity than is possible with standard digital imaging or photographic techniques.
3. Cell Phone OS, CHIPSET, CPU –
Cell phone OS – Different mobile manufacturers use different OS. It controls all basic operations of the computer. It allows the user to install and execute third-party apps, usually adding new functionality to the device. So go for latest version of OS present in market.
CHIPSET – All Smartphones are equipped with embedded chipsets that can do many different tasks depending on their programming. It is designed to support applications running in a mobile OS.
CPU (Central processing Unit) –
Also known as processor. There are many processors manufactures in market like MEDIATEK, ARM, but QUALCOMM’s snapdragon mobile processor still dominates. A multi-core processor is a single computing component with two or more independent actual processing units (called “cores”), In simple term a processor have more core means more powering our smartphones.
4. Battery Life –
I think all of us know, why we should consider battery backup before buying a smart phone. All smart phones are power hungry. None of functions is usable without power. Battery power are measured in mAH. A battery with more mAH will power a phone for longer amount of time for same usage.
5. Screen Resolution –
Screen resolution refers to the clarity of the text and images displayed on your screen. Means higher resolutions, much sharper image. So there are some term which tells about a smartphone screen.
1. Screen type is HD – (720 * 1080) resolution or FULL HD – (1920 * 1080) resolution. See below comparison of screen resolution of smartphones.
2. Pixels per inch (PPI) – is a measurement of the pixel density (resolution) of an electronic image device. PPI of a device can give a good indication of how clear the screen of a smartphone.
3. Types of Smart phone screen glasses –
There are many different types of displays / touchscreens available across the range of smartphones and it is important that we know about them before buying one.
TFT – LCD
IPS – LCD
6. Cell phone Memory –
Where to store our selfies, mobile camera’s snapshots, music files, apps etc. All smart phones must have a good amount of memory to save information. In most of the smart phone there are two types of memory measured in GB (Giga Byte).
1. Internal or built in memory – Internal storage generally refers to the storage space on your device that can be used for installing applications and their associated data. But some of the smart phone does not has external card slot, so they provide good amount of in built memory for our all-purpose.
2. External memory – Most of the smart phones provide an external memory card slot to increase device storage capacity.
7. Connectivity –
Means mobile networks should support latest technology like 4G (FDD-LTE, TD-LTE), 3G (TD-SCDMA, WCDMA).