so i got a iphone finally and its all fucked up on day 2. help anyone?

i hate cell phones and have been using prepaids forever, i finally used my cousins iphone during a shoot last week and saw the usefullness of doing my yahoomail, maps, and craigslist shit in the car, so i went to the mall and bought a 'free' phone with a 2yr contract from tmobile. this little shady sleepyhead dude says he can 'get' me an iphone for 200 bucks. i dont know if thats a deal or not since i dont keep up on this shit like i used to but i was like ok cool nigga get me the phone tommorow and i'll pay you.

so yesterday i break him off 200 and he swaps the sim cards and sets the shit up on some kind of data plan for me and i'm rolling. about 12 hrs later the big apple button with the square on the phone (there is only 1 button on it i think) stops responding. like i have to turn the fucking phone off and on which takes like 4 minutes to reboot etc just to make a call or get a text msg from the main menu since that 1 button controls everything.

so i'm pissed i cant multitask with the web and phone and text etc thats the whole point of the iphone i think. i dont know shit about apps and cracks and all that bullshit like i used to so can anyone help me use this POS. i am about ready to go back to the mall and jack this fool up. what is a iphone worth anyway, the back of it says 8gb