Weelly?

I have a similar problem. Two people, let's call them A and B, both from the same foreign country X, can send me texts without a problem. But... A never receives my texts, B always does. In both cases, my credit is deducted. A and B are with different providers in country X and I can confirm that other people with the same provider as A are affected the same way. I do not know anyone else with the same provider as B so cannot experiment there.

But here is the funny bit. When I am roaming, the situation is reversed. A always receives my texts, B never does. Go figure.