According to your description, not all mobile phones stop working as soon as they are in arrears. It may be that your number has been used for a long time, and it will be delayed because it meets the high credit rules. It is recommended that you pay the arrears in time, so as not to cause the phone to stop because the arrears exceed your credit limit.
Telecom arrears are blacklisted by telecom. After being blacklisted, you can't handle any telecom business in the system unless you pay the arrears. If you are blacklisted by Anhui Hefei Telecom, your certificate can't handle any business in Hefei Telecom until you pay the arrears.
Anhui Telecom will serve you wholeheartedly, and I hope my answer can be adopted by you.
If you have any questions, please consult the staff of Anhui Telecom's online business hall. Anhui Telecom has officially launched the 4G service.
You can go to the online business hall for details. Wish you a happy life!