How to Unlock the Blackberry 8500

1 - Using the menu go to Settings Menu -> SIM card press select.
2 - While holding the SHIFT key, type mepd
3 - You should now see the five locking categories listed.
4 - While holding the SHIFT KEY, type mep2.
5 - Release the shift key.
6 - You are now prompted to enter the Network MEP code (it will also state how many attempts left)
7 - Enter the code
8 - Enter Return/Enter
9 - The device should then be unlocked