Firstly, if your phone is in a region with weak 3G signal, we suggest you select “Use only 2G network” to prevent your mobile always switching between 2G and 3G network. Please press menu key from home screen ->“Settings”"->Wireless & networks”->“Mobile networks”->“GSM/UMTS Options”-> Select “Use only 2G networks”.

Secondly, please close some applications which are not used in background.
Please press menu key->Setting->“Applications”->“Running services”->select idle programs that you are not using.

Thirdly, you can adjust screen brightness. Please press menu key from home screen->“Settings”->“Display”->“Brightness”.

Fourthly, please deactivate Wi-Fi and Bluetooth when you are not using them.
Please press menu key from home screen->“Settings”->“Wireless & networks”-> deactivate “Wi-Fi” and “Bluetooth”.

Fifthly, you can disable ''Background data''.
Please press menu key from home screen->''Settings''->disable''Accounts & sync''.