If my iPhone 3GS is jailbroken, will AT&T let me upgrade my phone?

I have the 3GS and jailbroke it within three months of me owning it. It's been 2 years and I want to get a new phone, but will att say something when I arrive at their store with a jailbroken phone? An answer from personal experience would be great.

Factory reset
they will have no way of knowing it was jailbroken

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