How to Unlock my Blackberry ?

After you got your Unlocking Code, you will have to type it into your phone to unlock it. Use the following steps to do it:
!Sometimes when you restart your phone without the SimCard inserted or with a different carrier SimCard, the phone will automatically prompt you to insert the MEP2 code which is your Unlock Code (15 Digits) !
Make sure to remove the SimCard and turn all connections off.

Let's start with these simple method. Go to Menu - Options - Advanced Options - Scroll Down to SIM card (It might say "No Valid SimCard") - Type mepd on the SIM card screen (The network will be Active which means it is Locked) - On the same screen type mep2 - Finally, It will ask you to enter your code, if you have less or equal to 3 attempts left please try unlocking it with an expert or with your carrier provider.
When you are done, turn off your phone, insert your SimCard, and turn on your phone to start using it.

Now your phone in Unlocked and you can use it with any other carrier.