My m8 is temp rooted and I have also installed the AOSP text messaging app (https://play.google.com/store/apps/d...id=fr.slvn.mms
) When I receive (and probably also send) an MMS, it says downloading and hangs on the MMS download. It does download eventually I think. I receive the pop-up error "No APN specified on the device" repeatedly and non-stop it seems. I've tried resetting the APN to default and rebooting and that doesn't fix it. I also loaded up elixir2 to harcode my number into the MMSC string but none of those fields are writeable. The developer of the text message app says MMS is supported and to check the network settings. What else do I do?