139 Email SMS interface is missing.

What you want to ask is what should I do if I can't find the SMS interface of 139 mailbox? The solution is as follows:

1. After logging in to the email address of 139, look for "SMS" or "SMS" and other related options in the navigation bar at the top of the page, and click to enter the SMS sending interface.

2. On the home page of 139, find the related options such as "SMS" or "Send SMS", and click to enter the SMS sending interface.

3. Find relevant help documents in the help center or customer service center of 139 mailbox or contact customer service for help.