It should be that Unicom's mobile phone number has been cancelled due to long-term use through your proof, but this situation will cause historical arrears under your name. If the historical arrears are not settled for a long time, it will become Unicom's blacklisted customers, resulting in Unicom's mobile phone number not being used normally and unable to open a new account for new business. In this case, the owner can hold the original personal valid certificate to the local Unicom self-built business hall to inquire for you. If it is really caused by your previous number, historical arrears and liquidated damages can be settled.