My dad recently bought an At&t quickfire for my birthday but i had a t mobile sim card in my older phone. The quickfire is already unlocked, but i still don't get completely full service like i did with my other t mobile phone. for example: I get internet, but i cant download anything from it like apps and games. i also cant send or receive multimedia messages anymore. I know i cant use any of the apps that came with it like mobile tv, but is there any way i can mod it or whatever so that i can?