phone call issue
I can't seem to find a web article for my specific calling issue. Let's see if I can explain it correctly. My wife stated that every time she calls me she gets a busy signal (she's not blocked!). I have no other known trouble receiving calls. I always call her from the Phone>Favorites section with no issues, but she can't call me from her Phone>Recents tab. She has an iPhone 10 (not the S) and I have the 13 mini.
I popped my sim out a couple days in a row which didn't help her reach me but I tried anyway. Today she tried and got the busy, so she texted me saying to call her. This part is weird to me: I tapped her contact photo at the top of messages, and it displays Call, Video, Mail, and Info buttons. The call and video buttons are black and can't be tapped. I still successfully called her from the Phone app though.
I told my wife this, and she has the opposite issue. If she calls me from the Phone>Recents tab she still gets the busy signal, but if she copies me and taps my contact photo and the Call button she can successfully call me.
She's the contact in my Messages that I've noticed this problem with (so far). We both have the 1-(area code) in our phone number, we've both restarted our phones and put in airplain mode periodically with the same results.
It's nice we've got a workaround to call each other, but are there any ideas what the issue is?
Thank you all.
iPhone X