Hi if you want to unlock your sharp 912sh mobile from network lock .Then visit Superunlockcodes.com
here they ask you the network name to which your mobile is locked and the IMEI number of your mobile .Then at last they deliver you code to unlock your mobile .They also provider step by step instruction about how to unlock mobile .They are
1 - Switch ON your Sharp 912SH with an ACCEPTED SIM Card.
2 - From front screen type *01763*6371#.
3 - The Sharp 912SH will reset back to the main screen.
4 - Press M button.
5 - Scroll to Settings and press SELECT.
6 - Scroll to Security and press SELECT.
7 - Scroll to MEP locks and press SELECT.
8 - Enter your phone's Code and press OK.(the default code is 0000)
9 - Scroll to Network and press SELECT.
10 - Scroll to Deactivate and press SELECT.
11 - Enter the Unlock Code and press OK.
12 - The Sharp 912SH should then display DONE and be unlocked.