- Go to Options -> Advanced System Settings -> Sim card
- Hold shift while enter mepd, it will show a screen with network status. If it says network active, the phone is locked to AT&T
- Press the &%123 key to show the numeric keyboard
- Press and hold the &%123 key while enter mep. release the &%123 key and enter 2. Now you can enter the unlock code in the popup window and unlock your blackberry 9860
Leave a comment if it works for you!