If You Think More data on your smart phone. you should backup your all data After hard reset all data will be lost.
Make Sure Your Device battery is not Empty
Hard Reset Option 1
1. Press Power key For 2 second and Select The Power Off On Screen Wait Few Second Device Will Be turn Off. Now Remove The Battery And Replace The Battery.
2. After That Press And Hold Right Key + Left Key Now Press Power Key To Turn On Your Device than Follow Device Screen instructions.
Option 2
First Backup Your Data and Remove sim card and memory card.
1. Turn On Your Device.
2. Device home screen select Menu than Select Settings
3. Select Privacy
4. Than Tap Factory Data Reset
5. Select Reset Phone
6. Select Yes to confirm hard reset