I tried enabling "iPhone cellular calls" on my iPhone 5S, and the phone informed me that Wifi calling must be disabled to enable this feature. So it seems that the two features are not compatible with one another. Is this iPhone 5S specific? This is quite disappointing as I was hoping to have both enabled (cell service in my house isn't the best). It would be nice to know why they're mutually exclusive.
IOS – Why are Wifi Calling and iPhone Cellular Calls Mutually Exclusive
iosiphonemacos
Related Solutions
I say give Apple a shot. I've been successful in resolving similar upgrade issues by calling the support number or making a Genius Bar appointment.
Local repair shops are fine for fixing a hardware component (i.e. replacing a screen) but not much help for an iOS software problem. Also see ifixit.com for DIY hardware repairs. They are amazing.
Ok, figured it out myself. My first problem was that for some reason my phone hadn't activated properly with iMessage / FaceTime (my phone number was unchecked in the You can be reached by FaceTime At section in FaceTime settings). That required switching off FaceTime and iMessage and switching them back on again after a short wait so that they could activate properly, which they did.
Once that was done, my FaceTime settings (on my iPhone) had a new option: iPhone Mobile Calls:
My wife's phone also has that setting. Choosing which phone is used is just a question of only having this setting enabled on one phone at a time. I assume (all though I haven't tried it) that if both phones are enabled in this way, FaceTime on iPad or Mac gives you the choice of which phone/number to use. It wasn't giving me a choice earlier because there was only one phone enabled.
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Best Answer
In the past, the modem software for a specific carrier was responsible for that prompt as their networks weren't able to re-reount the calls on the fly. (i.e. your carrier or carrier settings needing an update was the original issue)
I believe that window of limitation is resolved for all devices and all carriers. If you get this error in 2017, I would work with Apple support to make sure your iOS is updated and then work with carrier support to make sure your phone account is set up for seamless switch between carrier and wifi calling.