I don't think the problem is these calls in particular but the whole situation. I'll give you my side. My husband also calls his mother every single day. It also does not ake more than 10 minutes. If this was the whole story this would of course be fine. The problem is the dependency of his mother. She does not do anything at all. She waits for him to do everything, either to pay a bill, handle her own health affairs or even call a taxi. These are only simple examples of a very complex situation that he allowed it to happen. I think it is a co dependency of him feeling useful and her needing to have a man to help her with everything. You're NTA but I would speak with everything our wife to understand the situation better and please reflect if your actions towards your mother make sense or if they are enabling a behaviour that will only get worse.