How to buy a best mobile phone?

I show you step by step how to buy a best mobile.You must analyze how much money spend to buy a mobile.

first you must choose operating system like android,ios,java and windows.I choose android and spend below 7000 rupees.Which type company mobile do you want.   

I like Mote E

Operating System:Android

Company:Motorola

Size:4.3 inch

Ram:1gb

CPU:1.2 GHz cortex-a7

Internal memory:4gb

Cam:5mp

Front cam:none

Glass type:Gorilla Glass

Color:White

Android version:KitKat 4.4

Bluetooth:v4.0

SIM:dual SIM(micro-sim)

Battery Backup:7 hours.