Blackberry Pearl the phone says I have an invalid SIM. How do I enable SIM when...

...unlocking? I have the code.? Recently purchased a Blackberry Pearl off Ebay. The phone says my SIM is invalid. Have tried three SIM cards. AT&T says that I needed an unlock code and sent it to me. When entering the unlock code... The phone shows the SIM is disabled. Does anyone know how to enable the SIM? I have not had any luck.

You need to contact the network provider for it...they will enable the sim and then you can use the unlock code to unlock your phone.Recently, i unlocked my Blackberry Pearl using the unlock code from unBBlock.com and did not face any problem.