So I cannot speak to ofono, but modemmanager largely does support MMS, with two exceptions:
- The APN for mobile broadband needs to be the same for MMS (modemmanager does not have support for multiple APNs yet), and
- "transfer-route MT messages" aren't implemented (which some carriers use for MMS, but it is not clear for me to how).
The larger issue is that there is no stack on phosh to support any of this. I proposed a couple of ideas of how such as stack would work on their git site, but I don't have the time to impliment it.
From what I saw with scapebar, it does not have native support to send picture messages (MMS), does not recieve picture messages, and did not have a way to send a group message (MMS). I am admittedly not familiar enough with ofono to know what works or how it functions in the stack. However, there is MMS support in the patched ofono stack below:
