Also, when I use commands listed at https://itgrenade.wordpress.com/2016/09/14/use-mmcli-for-sending-sms/ to try to for example send a message from the command line, it seems to create the message (gives me a path) but when I try to store or send the message it gives the same path mentioned in the send but says it is not found. ModemManager is running:
root 580 1 0 16:51 ? 00:00:00 /usr/sbin/ModemManager
Is it supposed to running with some options or something? I did try stopping and running with debug option at one point before these issues happened.
Note also that with updates applied to day I moved to the 5.11 kernel but I was having the problem before that update too.