Model : T-mobile Blackberry Models

1 -  On the Home screen, click the Tools icon. The Options screen appears.
2 -  In the tools screen, select the Settings icon.
3 -  Scroll to SIM Card and select it. You should see the phone number and the SIM ID number.
4 -  Type 'mepd' to display the first five levels of SIM locking.

T-Mobile uses network locking so the Network should display Active. All other states should display Disabled

Please note: For the Blackberry 7100t you will hit the "P" twice when entering the 'mepd' and 'mep2' for steps 4 & 5.

5 - Type 'mep2' to display the dialog box asking for the unlock code (Press the Alt + 2 key to get the number 2)
6 - Input the Network Unlock code
7 - Press ENTER and reboot handheld.

Model :  Blackberry Pearl 8100 (Alternative instructions if above instructions do not work)

Can be done without a sim card inserted

To Unlock:

1 - While on the home screen, click the "blackberry key" on keyboard, then select "options".
2 -  Choose "Advanced Options".
3 -  Select "Sim Card"
4 - There is no area to type these letters, you just type them as instructed. No need to hit keys twice to get a letter either. Type m e p p d to display the first five levels of SIM locking. Most companies use network locking so the Network should display Active. All other states should display Disabled ( you will not see text appear on screen
while typing )
5 - Type m e p p 2 to display the dialog box asking for the unlock code
(Press the Alt + 2 key to get the number 2) ( you will not see text
appear on screen while typing )
6 - Input the SIM Unlock code
7 - Press in the trackball in once

 

 Model :  Blackberry Pearl 8700

1 Insert Cingular SIM into device
2 Power phone on and Turn off the radio (Turn Wireless Off option) VERY IMPORTANT.
3 Select "Options"
4 Select "Advanced Options"
5 Scroll down and select "SIM Card"
6 Type "MEPD"
7 Type "MEP2"
8 Enter the Unlock Code
9 Press enter
10 Reboot device. Device is now unlocked.