SMS reminder, email reminder.

1. SMS reminder: Receiving account change notifications through mobile phone text messages is a real-time and convenient way. This method can ensure that users receive notifications of maintenance credit card account changes at the first time, so that they can be maintained in a timely manner. Take appropriate action.

2. Email reminder: It is also a common way to receive account change notifications via email. Users need to ensure the accuracy of the email address in order to receive timely notifications.