If I unlock a sprint blackberry 8800 will my AT&T Sim work?

Pleasehelp

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I have a Blackberry 8310 with AT&T however it just broke, I also have an old Sprint Blackberry 8800. if I unlock the sprint blackberry will my AT&T sim card work? And allow me to use it as usual?
Alright I checked its a Sprint 8830. My AT&T SIM card fits inside of it, its locked to sprint, if I unlock it; it should work right?
I got an unlock code, but apparantly someone has tried unlocking this phone before, I have 0 Tries left. Is there anyway I can reset my tries? If you can answer this you're the best answer
 
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