How long has it been since Momo logged in and asked for SMS verification?

If you haven't logged in for a month or two, you have to verify it by SMS.

SMS authentication is a certificate given by an enterprise to consumers (users), and the identity is verified by the code of SMS content.

The most commonly used are online banking, online shopping malls, group buying websites, ticketing companies and so on. SMS verification code uses SMS verification code to register members, which greatly reduces the data of illegal registration and bad registration.