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 ...

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 ...