because you owe money when you overdraw your credit line, if you don't pay the phone bill and continue to use it, it will lead to arrears and downtime. If the post-paid users owe money for their mobile phones for more than 3 months, China Unicom will recycle the number. The fees owed should also be paid, otherwise they will become blacklisted users and cannot handle Unicom business. If you don't need to use them, please go to the local business hall to cancel the account. Because the policies of different cities are different, the local policies shall prevail. You can consult the local manual customer service or visit the local business hall to find out.