I recently purchased a blackberry 9550 mistakenly for verizion but i am with AT&t and ive done some research and i need some help on how to download the service books i need and the steps i need to go through in order to recieve calls and text for my phone and also to make that phone my previous AT&Ts phone number which i would think would be on the sim card which i do have.Please touch on all the questions i have and any feedback is appreciated thanks!