What you are asking is a bit vague but I will try to answer it to my interpretation of your question.
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Originally Posted by coppermine18
Is it basically VoIP with Sprint atm?
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Sprint uses a standard called CDMA which unlike gsm uses ESN numbers embedded into the device itself for identification
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Is it the same with ATT, however they are gsm?
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AT&T can do voice and data at same time because GSM allows it in the specifications.
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So would it not only be a registry entry but also radio firmware and network configuration issue? Kind of like data and voice being on different ports and limiting access?
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It will not work due to the specifications of CDMA.. imagine trying to putting a square in a triangle socket. Later revisions of CDMA do allow voice + data but sprint will most likely not bother updating to that spec..Europe also has WCDMA which uses similar to sim cards but cdma but USA carriers have no interest in it either.