For more than six months now, s.o. is (perhaps accidentally) paying my mobile bill. I have two sim cards, one is data, almost unused. Called the operator twice, concerned that a granny is messing the user ID, or that s.o. is trying to impersonate me by paying the bills and then claiming ownership. Two times reps. assure me that they have no clue who does the payment as it arrives from a partner network taking cash payments only, and that it is impossible for anyone person to claim ownership of the SIM.

And while the amount is not a large one, it is still very suspicious this keeps going on, even after two very long calls with the support. I'm going to soon speak to the partner network, but it is appalling how much these people are not interested in who actually gives their enterprise money. They're only there to take it.

What does SO stand for here? I assumed Significant Other but that doesn’t square with the story as surely you’d just ask

any chance someone who knows you is simply paying your bill out of kindness?