Unicom number registered in the real-name registration system, if the downtime exceeds a certain time, Unicom has the right to take back the number use right. According to the types of prepaid and post-paid packages actually used by individuals, there are differences in handling. (1) If the prepaid user does not recharge all the time, Unicom will automatically recover the number after the deadline; (2) If the post-paid user fails to pay the arrears, the user will be blacklisted by Unicom, which will affect your future Unicom business. I suggest you pay the arrears in the business hall in time. If the arrears exceed 3 months, Unicom will recover the number. If the card under the owner's name has historical arrears, the owed money must also be paid by the owner, otherwise it will become a blacklisted user and cannot handle Unicom business again. If you don't have to use a card, please go to Unicom's own business hall where the number belongs to handle the cancellation procedures. The mobile phone number with contract plan cannot be used for account cancellation during the contract period. Due to the donation rules (such as deposit fee, monthly donation of grants, etc. ), some contract agreements of China Unicom will have an agreement term, which is clearly stipulated when handling. In order to avoid affecting the return of grants or pre-deposits, it is recommended that you cancel your account after the agreement period. Tip: Local policies are different, depending on local policies. You can consult the manual customer service of Unicom where the number belongs, or you can go to Unicom's own business hall where the number belongs.