Forgot my password
I put a Password in my phone an can not get back in
iPhone 4S, iOS 5.1.1
Options for when an iOS device gets locked because of forgotten passcode:
Restore (and reset passcode) on your device by connecting it to the last computer to which it was connected:
iTunes: Backing up, updating, and restoring iOS software - http://support.apple.com/kb/HT1414
If you cannot connect it to the computer to which the device was last connected you will have to use recovery mode to completely reset the device, losing all data:
iOS: Unable to update or restore - http://support.apple.com/kb/HT1808 - recovery mode (e.g., cannot connect to computer last used to sync device, iTunes still asks for a password)