From Repair Mobile
[edit]
How to Enter Unlock Codes on T-Mobile BlackBerry Cell Phones:
- On the Home screen, click the Tools icon. The Options screen appears.
- In the tools screen, select the Settings icon.
- Scroll to SIM Card and select it. You should see the phone number and the SIM ID number.
- Type ‘mepd’ to display the first five levels of SIM locking. More details [1] - thanks to cellphonerepair.org
