Unable to make calls on iPhone XR
I recently inherited my sons XR. When I tried to make a call, it said, Last line no longer available. Do you want to use your remaining line? According to an old discussion, I deleted recent and missed calls and it seemed to fix the issue. When I used the phone in the car, the same pop up came on. If I use CarPlay, it does not seem to be a problem. It seems silly to have to go through an extra step every time I want to make a call on my iPhone. Any ideas? Thanks.
[Re-Titled by Moderator]