In certain circumstances, the issue is limited to a specific file type, such as picture files that do not communicate over iMessage or ordinary text messages. Because the file is corrupted, it may not be transmitted. When sending messages with large files attached, the same thing might happen.
solution
Try resetting your iPhone network to eliminate the likely reasons of improper network settings and network issues. This will clear all of your Wi-Fi networks and passwords, as well as your cellular settings, VPN, and APN settings. If any mistakes or improper settings are enabled, they will be corrected during the procedure. Make a note of your network passwords, then follow these instructions to reset your iPhone 7's network settings:
- Go to the Settings tab.
- Select General.
- Restart by pressing the Reset button.
- Select Reset Network Settings from the drop-down menu.
- Wait until your iPhone reboots and completes the network reset. After that, set up your networks and check to see whether MMS is operating properly.
