Question about phones?

I have a RazrV3 currently, I paid $200 for it. I was wondering can I trade it in at the same T-Mobile dealer I bought it from and buy a Sidekick or a different Motorla phone. I was wondering because the N-Gage is $250, If I trade in the RazrV3 will I only add $50 more or will I have to pay the full price?

Also the camera on my Razr dosen't want to work for me, it worked a few times and then whenever i click on Camera, it just shows a black screen and the phone turns off. Then a white screen appears for about 10 seconds, and the phone goes back to normal. I don't have a warranty on this phone, will they look at it, fix it , exchange it???

Thanks

I'm sorry if these questions are dumb, i'm new to the whole T-mobile Cell phone thing.

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couldnt tell you if they would look at it if you didnt day anything. since you dont have a warranty you may have to pay for the replacment yada yada. and if it was 200 and you got the full price back then yeah 50 would be it.

Well Motorola has a 1-year warranty on the RAZR if you purchased it new with a contract. If you would like to get a new/different phone, the place you bought it from should have a trial/exchange period which would allow you to take the phone back and pay the difference on a different one. The store I work at has a 14-day exchange policy.