samsung A157 AT&T free unlock

this is how to unlock samsung A157 lock at AT&T.

Step 1: Remove sim card from phone and turn the phone on.
Step 2: Dial *2767*3855# This will  initiate a Full reset for Samsung A157
Step 3: Once the phone restarts, dial #*7337# This will remove sim lock and reset phone
Step 4: Now insert your sim card. and restart the phone.