Solutions:
1. Try to change the theme. Maybe the theme font color is the same as MMS font color, so it cannot be seen.
2. Change a SIM card.Other SIM CARDS are put on phones to try to accept MMS, whether they still appear.
3. Turn off the automatic download of MMS and download manually after receiving the MMS. SMS Settings - Advanced Settings - Automatic download - Turn Off.
4. Enable WAP push.
5. Reset access point APN.
6. Whether to install third-party optimization software, power saving software, forced termination process software, etc. It is recommended to close or uninstall, then backup the data and restore factory Settings, or update to the latest version without restoring backup and try to receive MMS.