Xiaomi Mi 4 is the mobile iam using currently.
Bought 6 months ago. No issues till now. 2GB ram and 8Gb internal storage. Faster speed. No bugs till now. The battery is 3100m Ah . Its good but excessive internet usage may cause decreased battery life. But normal usage is around 1 day completely. Inbuilt application locker and cleaner. Ir is a 4g compatible device. But it is a single sim phone. Large display to give a bold look. The video clarity is also cool. The rear camera is 13 mp and the pictures are awesome.