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Help Does Wi-Fi Calling Use Mins?

i know the purpose of wi-fi (uma) calling on the blackberry but i don't understand what its for on the mt4g?

If you get poor reception but have wifi.

However, it was not so clear what happens if you use google voice over a wi-fi connection...

Google Voice on Android isn't natively a VOIP app, but it's naturally more complicated than just that. Link
 
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Comes in handy too when you're out of the country. For 2 weeks I was in London and Paris several months ago on business and it's really nice to use it to make calls home and not get charged. Totally free! $0. Also, my home and office get squat for reception, so having wifi calling is a must. Good though because I would have bought the Galaxy S if I didn't need wifi calling.
 
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