Originally Posted by mackconsult
Because I bought an unlocked phone so that I can switch carriers when my plan gets to its expiration date.
It doesn't quite work like that with BlackBerry devices chief. Many carriers, including T-Mobile and AT&T are only allowing BlackBerry devices on their network that they sold, and it's done by IMEI, so there is no easy way around it. Customer care may be able to manipulate the IMEI that's associated to your SIM within their computers, but it's unlikely. I recommend buying a T-Mobile one that is either already unlocked or get it unlocked on receipt. The other reason is so that you can take advantage of T-Mobile's 3G services, which operate on bands that are different from other carriers.