Will a jailbroken iPhone 4 still work with my AT&T contract?

Well my Samsung phone has hit rock bottom and now I'm about to get a jailbroken iPhone 4. My only concern is if I get this iPhone will my regular AT&T contract still work with it? Like Internet and text messaging? I'm still on a contract with AT&T where I have 200mb of Internet and unlimited texting so my only concern is if I switch to this phone will it affect my contract in any way?

It will work the same, you will need a micro sim card if you don't already have one.

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