@lsitongia OK that is some progress, with the PRODATA for Internet APN entry. There are some MMS patches getting made as we speak, they are being targeted for OTA-21.
Again, the ofono 28 linked above for a "combined APN" (for "Internet + MMS") isn't quite ready but will further improve things when it gets in: I am currently using it and it works well (I can get MMS on 3G now, couldn't before with separate APN for MMS and Internet), but it will reset APN entries often (so I needed to edit the "defaults" so when they are deleted and reset they are still correct) so there are some bugs / blockers. Defaults come from /usr/share/mobile-broadband-provider-info/serviceproviders.xml