Does Apple and either AT&T or Verizon currently allow voip services to be used? Essentially, would a user be able to have phone services by using just a data plan?


From a technological standpoint this is possible - Skype makes voice calls just fine over 3G data on my iPhone. However, as far as I know, AT&T and Verizon do not permit you to run phone devices on their network without a phone plan, so it's unlikely that you will be able to do what you're looking for, as least officially.

I have heard that some people have had success transplanting the iPad SIM into an iPhone, but it's not something that's guaranteed to work and AT&T may block its use at some point in the future, if they haven't already.

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