I'm assuming you have CWM. Enter recovery mode (google enter recovery mode if you don't have a clue.). Then go to Backup and Restore, and select Backup. Wait for it to finish, and then reboot. Done!
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Got USB debugging on? You'll need it:)
Step 1: Save some Odin files anywhere you like.
Step 2: Connect your cable.
Open the version of Odin that works for you.
Step 4: Get your files inside. (Phone is actually Modem.)
Now go to download mode on your phone.
Step 6: Now press the start button...
Easy, just go to Settings > Location and Security > SIM Card Lock. There should be something to disable that under there, if you know the PIN on your SIM.
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