What if Huawei's SMS signature can't be opened?

Go to Huawei's mobile phone after-sales store for repair. Huawei's mobile phone SMS signature can't be opened because the SMS program has been streamlined and can't be restored artificially. Need to be repaired in Huawei's mobile phone after-sales store. Short message signature is the signature information created according to the user's identity and in line with its own attributes, which can only be used after approval.