Adara, I can't speak for operations abroad, but here in the USA, your assessment is essentially correct:
https://community.verizonwireless.com/thread/818232
According to this link, calls and SMS go over 1x. MMS (picture messages and group messages) go over 3g/4g. Wifi is for data only, not voice calls or SMS/MMS. Or that's what I get out of it.
I assume it works the same on AT&T, TMo and Sprint too.
I have no idea if/how VoLTE will affect that dynamic.
https://community.verizonwireless.com/thread/818232
According to this link, calls and SMS go over 1x. MMS (picture messages and group messages) go over 3g/4g. Wifi is for data only, not voice calls or SMS/MMS. Or that's what I get out of it.
I assume it works the same on AT&T, TMo and Sprint too.
I have no idea if/how VoLTE will affect that dynamic.
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