I don’t understand how this is happening. Whenever I get a FaceTime call, my phone, computer etc all ring and allow me to answer the call. But my iPad (Pro M4) only shows a small icon on the top right ...

Apple has released iOS 12.5.8 for a small group of older devices, to make sure they can continue using FaceTime and iMessage.

Now correct me if I'm wrong but FaceTime on the iPad is restricted to wifi like the iPhone 4 so over 3G you can't do it. But if you use Personal Hotspot on one of them will it allow you to do FaceTime ...