MEP is an 8 digit number that identifies the current network provider on your phone (ex: MEP-04104-003). We use this number together with IMEI to calculate an unique unlock code for your BlackBerry. We need this number to guarantee that the code you receive will work 100% of the time.
With some network providers your actual MEP might be different from the number your carrier usually uses. That is why we need to receive MEP number from you. It will also guarantee that the unlock code you receive will work 100%.
Get your BlackBerry unlock codes from N4BB here.