I'm looking into buying a used Blackberry Pearl 8120 from a t-mobile customer. I have t-mobile prepaid service, and I want to know if my sim card will work in the phone. From what I understand, he had a t-mobile contract, and the phone is not unlocked.
It might work but if both the T-mobile are of different country then you need to unlock before swapping networks. I suggest you can approach Mobileunlocksolutions.com and specify the country,locked network of Blackberry Pearl 8120 .Based on the availability you can get the permanent unlock service along with free instructions.