If you send pictures, audio or video in Messages, it will still convert and send as an MMS.
You can still open the message in the in the Messages app, and manually download its contents.
If you’re using multiple SIM cards, you’ll see multiple SIM tabs at the top. You can switch between your different phone accounts’ settings here.
These settings must be editable in order to manually block MMS service. If these settings are grayed out, you don’t have the option to manually block your MMS access points. You will have to approach your mobile service provider.
You will have to repeat this process for each of these three options.
If you want to reactivate your MMS service, just remove the “*” or “#”.
