How to Enter Unlock Codes on BlackBerry 8100 Pearl:
Step Action
1 Insert SIM into device
2 Power phone on and Turn off the radio (Turn Wireless Off option) VERY IMPORTANT.
3 Select "Options" THEN SELECT ADVANCED OPTIONS
4 Scroll down and select "SIM Card"
5 Type "MEPPD" (please note that you will not see what you type on the screen)
6 Type "MEPP then [ALT BUTTON] then 2" (please note that you will not see what you type on the screen)
7 Enter the Unlock Code
8 Press enter
9 Reboot device. Device is now unlocked.