Why is it that when I had tmobile in my house, I had WiFi calling. Not as an add on feature, because when I would turn it on, it would popup a msg telling me that using it still takes away from plan minutes. Well recently I switched to WalMart Family Mobile, & it simply won't work, it tells me that I'm not registered on the t mobile network. It is the tmo network, no? By the way, I am using the mt4g. It should work, but possibly there are settings that can be changed?
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