This has two components. If you are strictly on cell towers (3G, 4G) then it matters if you provider offers duplex communication. If you are connected by WiFi you could still get Internet while talking on the phone. I had Sprint and that worked. I now have T-Mobile and it works there too. I moved to T-Mobile cause I get lousy cell signal at home and they are the only provider that has WiFi Calling. I can make and receive calls, and texts with no signal bars if I am on WiFi. This feature rocks!
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