This is how to unlock a Blackberry 9100 - 9105 when it says Invalid SIM card.
It may be necessary to turn connections off at this point, if they are not already.
- Go To Menu - Settings - Options - Advanced Options - SIM Card to see the following, blank, screen.
- Type MEPP2 on the blackberry keyboard (to get the 2 use the alt key). The letters are not displayed on the screen while being typed, but if these letters are entered correctly, the following screen is displayed.
- Enter the unlock code.
If successful, the following screen is displayed.