Steps are given below:
1. Turn off your mobile phone,
2. Now, Turn on the phone without sim card,
3. Then type #pw+123456789012345+1#
4. Message "SIM restriction OFF" appears, Your phone is now unlocked,
Tips : continuously press * ( star ) button to type , + , w , p symbol.
You have only 3 attempts to enter the code. The last failed attempt will block the counter.