Will my t-mobile G2 Touch contract sim work in a t-mobile bought Blackberry curve 8520?
If both the phones use the T-mobile network of same country you will be able to use the Blackberry 8520 Curve with the contract sim..If not you need to unlock the phone.To unlock your Blackberry approach unBBlock.com and get the permanent unlock solution.Once unlcoked you can switch sim cards.