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what kind of VoIP are we talking about?
IIRC Evdo Rev A. allow for VoIP call so that you don't have to drop the EVDO data session when a phone call come in, since no rev A yet... no VoIP?
HSDPA on ATT also allow for similar VoIP call as EVDO Rev A.
unless you are talking about some other VoIP like Skype or what not?
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