I owe money on my mobile phone, but I can still answer the phone and send and receive text messages.

There are two possibilities: first, your mobile phone has "credibility" and allows a certain amount of arrears. Second, the operation of the business hall is wrong. But anyway, since you don't want to use it, don't call again. You will be reminded later. Just ignore him. If you owe too much, you may be sued. ) generally, it will go away.