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I think the carrier has to enable such features on their end too.
For example i beleive verizon recently did something to their network where if you are on a rev0 data connection and a call comes in the data connection doesn't exactly get shut off but rather just put on 'hold' or something. I forget the specifics but i seem to recall originally if you got a voice call and had data it would dump your data connection but I think now it just goes to sleep or something.
I would assume they would have to upgrade the roms and then also change the settings on their end too.
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