Unlocking iPhone 4gs on Sprint with trimmed sim card?

Help please… I thought that I could trim my sim card ans have it work in the iPhone 4S and it fits perfectly but i can't unlcok the phone. I'm running 5.1.1 Please Help. My mom is going to KILL me.

Yikes! You can only unlock an AT&T iPhone! I wish you the best of luck with your mother, and as always, may the odds be ever in your favor.