Nokia phones from T-Mobile USA / Fido / Rogers:
Power on without sim, type in
#pw+code+1#
Use the * key to get the p, w, and + on Non-Smartphone Nokias
If you receive a code error after using this method, try once more like this #pw+code+7#
T-Mobile Sidekick Slide
Power on with a Non T-Mobile sim, enter unlock code when prompted
