How do I know I've seen the MMS?

If you want to know whether the other party has received the MMS after sending it, there are two solutions:

1. Open the SMS interface, click "Settings" in the upper right corner, enter the settings page, and find the column of "Reminder and Notification"; Turn on the "report delivery" switch, and the other party will return the report after receiving the text message; Find the "MMS Reading Report" in the advanced settings, open it and send a reading receipt.

Send MMS after setting. If the transmission is unsuccessful, there will be a SMS reminder. After receiving the multimedia message, the other party will display the sent message at the bottom of the message, and the other party will display the read message after reading it.

In fact, the easiest way is to send another short message or call the other party to ask if you have received the MMS. If the other party doesn't read it, it can also be used as a reminder.

If you use an Apple mobile phone, you can only use imessage, which requires that both parties are Apple systems and connected to the network, so that the information sent is free network information, as well as pictures and videos. It can be sent in addition to text. There is an option of "send read receipt" in imessage settings, which can show that the message has been delivered after the other party receives it.