the way the calls are routed are... you make a call via wifi, goes to internet service provider, then routed to your cell phone carrier, off to the other persons carrier (landline or cell) and then to the other persons phone...
so as you can see your carrier is in there to know what is going on...
the benefit to UMA, is no matter what... if you are connected to wifi you calls will be free if you have the talkspot option on your account... so you could be at home, or a friends house, starbucks, or in england... its all the same... make sense?
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