It's been a long time since I shared with you a pan of illness that I just met yesterday, with the devices falling slightly or dropping you to test whether there is full wave or not, if there is a wave that can't be called, you can separate the main wave. Total 2 points as shown below if lost leg, then search and re-line in line, with the machine sometimes falls down sometimes you test carefully.
Search keyword: iPhone Xs Max does not receive incoming calls, iPhone does not receive incoming calls, iPhone does not display incoming calls, your iPhone cannot make and receive calls until updated, Number Caller ID failed, iPhone 8 Plus received no call, Error not receiving FaceTime call, iPhone 5s received an incoming call.
Good luck!
