China Mobile Electronic Signature is a customer. China Mobile's electronic signature refers to an electronic signature method in which customers use their mobile phone numbers as signature credentials to complete the signature operation on the Internet. Customers can use their mobile phone numbers as signature documents, complete the signature operation on the Internet, and use them as electronic signatures of various contracts, agreements and other documents. The validity and legal effect of electronic signature are the same as that of handwritten signature, which can also improve the efficiency and security of signature.