Just for a grin I downloaded the magic jack app to my fire and nexus. I have a account with them and I wanted to see if my tablets could use my account with out a dongle.
I can say for a fact with wifi I can make calls with my FireHd and nexus with no problem except that I need to be in a wifi hot spot.
I would guess with 3g-4g you should be able to do the same. Magic Jack works but I am not sure what other voip systems would work.
Magic Jack does with wifi.
Good luck,
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