Settings > Mobile network > (Select a SIM) > MMS messages Send & receive when mobile data is off = ONNow RCS is on its way to replace MMS.
Computer Tips - Android: download MMS with wi-fi / mobile data not required
Date: 2024jul23
OS: Android
Q. Android: download MMS with wi-fi / mobile data not required
A. There is a setting to be able to download MMS via Wi-fi.
It really should be on by default.