Tweet Phone Unlock Instructions for Bell Canada 9700 (Bold 2 Onyx):

Note: You must have a SIM card in your phone to complete these
steps, I have found that this procedure works best with an Telus
Sim card in the phone (can be active or inactive ). Make sure the
phone is not displaying the low battery warning!
1) Power on
2) Go to Settings
3) Go to Options
4) Go to Advanced Options
5) Go to Sim Card
6) HOLD ALT and press: mep2 (Please note that you will NOT see
what you type on the screen)
7) It will ask you for the mep2 code. Enter it and then press
trackball to confirm.
8) After getting message 'Code Accepted', HOLD ALT and press the
following: mep4 (Please note that you will NOT see what you type
on the screen)
9 It will ask you for the mep4 code. Enter it and then press
trackball to confirm. You phone is now unlocked!