Originally Posted by
Michael Ad
If the phone isn't even on (as in, fully shut down) then it can't be a cell call. It has to be a Wifi call.
Originally Posted by
IslesFan
Only reason I'm asking is my iPad can use cellular to make a voice call without the iphone being on.
Actually, yes it can...and is...a cellular call even if the iPhone is off. How this works with T-Mobile is that the call is technically made as VoIP via Cellular data on the iPad. However, since the cellular hand-off (calls on other devices) feature REQUIRES the carrier network to identify the account/phone number of the calling device, T-Mobile charges these calls against your cellular minutes. In the US, those calls would be free with most accounts. However, when traveling abroad, your calling minutes are charged at .20¢ per minute or higher depending on the location. Again, all of this is according to my contact in the network engineering section in Bellevue.