Exactly....that's been discussed MANY times . That's my go to
..but...full disclosure..it only works when you have wifi...won't work in the car if that's what you want ...AND ....making a SXM local call on wifi WILL have a charge attached..not a biggie but should be upfront with it
Calling the USA or getting calls from the USA (convenient home cell number) works great and zip charge, I've used it in many countries
AT&T has a similar app called AT&T Smart Wi-Fi. I'm sure other carriers have the same capacity.
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