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GV is not a VoIP service, it uses your network and your minutes.

My GV # is on my aList so when it calls me back I'm not using minutes. I only use this means to call landlines cause with AT&T we have mobile to any mobile.

When it calls be back and I'm connected to call the voice call is on AT&T network?
 
When it calls be back and I'm connected to call the voice call is on AT&T network?

Unless your phone can connect to one of the other carriers (doubtful), then yes. It's not like GV moves your phone over to TMobile for its call...
 
Unless your phone can connect to one of the other carriers (doubtful), then yes. It's not like GV moves your phone over to TMobile for its call...

Reason I ask is because quality of call although good enough for voice doesn't seem as good quality as making call direct. I thought maybe it's possible on a different frequency or something.
 
Reason I ask is because quality of call although good enough for voice doesn't seem as good quality as making call direct. I thought maybe it's possible on a different frequency or something.

It definitely is running through some sort of VoIP network at some segment of the call. The increased latency is very noticeable.
 
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