Wife invited new upstairs neighbour in, she had a problem with her (android) phone: people could call her, but she wasn't able to call anyone. Her phone showed the outgoing call, but the other phone never received it.

So we started digging, seeing if she accidentally misconfigured something. She tried calling my phone, it rang for 30 seconds, nothing. Cancelled the call, we went looking in settings and whatnot... 5 minutes later, my phone rings, and she's calling. While her phone is in my hand, and the call app isn't running.

The problem isn't on the provider side, because we're using the same provider, and we can call just fine. She's not behind on payments or anything either. Nothing's blocked. Nothing is misconfigured.

We were about to give up, and she accepted that she'll have to visit customer service in person (she doesn't have a laptop, can't call them, and even if she could, she wouldn't understand a word they're telling her) to fix it, when my Wife chips in:

Have you tried turning it off and on again?

Dear Fedi! We did not. We tried, and her phone magically started working again.

I now feel more ashamed than anytime in the past decade or so.