As I understand it, continuity enables a wifi only device to work in conjunction with an iPhone to make / receive calls. If an inbound phone call is picked up on the iPad and the iPhone's battery fails in the middle of the call, will the call drop? I am trying to understand exactly how the call is routed and if the call is a VOIP call through the internet or router through the iPhone's GSM radio.
Continuity limitations
continuity
Related Solutions
Be sure that the two devices are connected via wifi and bluetooth. If Bluetooth has lost the link, go into settings and find the other device, touch 'connect'. Check both ways. I am not sure if handoff will work on your iPad. At least update to the latest systems. Good luck!
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.
Best Answer
Calls are received as a normal call on your phone and then it uses wifi to tell other devices on the same network that a phone call is incoming. If accepted on other devices, the phone is used as a proxy. Voice data is transferred from the device to the iPhone over wifi and then to the cellular network and vice versa. If your phone dies the call will drop. If your phone goes out of wifi, I think the call will be transferred to your iPhone.
This is different from Wi-Fi calling which doesn't require your iPhone on the same network.