Hardware reset
If the phone hardware is jammed, you should first
recommend that the consumer performs a hardware reset. 
The hardware reset does not reset the Windows Live ID or 
remove any consumer data.
To perform a hardware reset, remove the battery and wait 
for one minute before reinserting it. Boot up the phone 
normally.
Software / operating system (OS) reset
The software / operating system (OS) reset returns the phone to its out-of-the-box state. Note that this 
procedure erases all consumer data! Always first try to perform a hardware reset.
Option 1: About men
- Use this option if the consumer knows the lock code 
- This option warns the consumer about data loss! 
-Tap Settings > About > reset your phone