Who do i take my iPhone to to get fixed?

I have a jail broken iPhone 4s with problems that I need resolved. I have Tmobile as my carrier, but the phone itself is by AT&T. I didn't buy it from the actual AT&T or Tmobile stores but one of the cellphone stores. Who do I take it to if I have problems with my phone?

The apple store

Take it to apple maybe. They can help you better because there the one who CREATED The phone itsself.

The apple store. It's usually in the malls.

No AT&T or the Apple store can npt help with jailbroken iphones what's wrong with it? Where I live there's phone shops were they fix all types of phones I had a jailbroken iPhone they suck I hever had signal I had to sell it but anyways look on craigslist may be someone fixes phones and they can help
GOOD LUCK!
you should try the Tmobile Exhibit 4g they sell them at walmart I got mine for $190 and its nice I love it its super fast!

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