How to Unlock a MyTouch 3G for Free

1. Get your MyTouch 3G IMEI number by typing '*#06#' at the phone's home screen.

2. Call T-Mobile customer support at 1-800-937-8997 and request an unlock code. Be prepared to give the representative your name, mobile number, IMEI number and email address. Your unlock code should then be sent to the email address you provided. If you're unaware of your SIM card PIN, it's also a good idea to request this from the representative at this time.

3. Power down your MyTouch 3G. Remove its SIM card (located beneath the phone's battery) and replace it with your new foreign or prepaid SIM.

4. Power your phone back on. Enter your SIM card PIN, if prompted.

5. Enter the unlock code that you previously received when your phone prompts you to enter an unlock code. Your MyTouch 3G should now be unlocked and ready to use with your new service provider.