@mikeand if you are still interested in solving this issue, you could try the following:

with Ubuntu Touch started, open a terminal and make the root partition writable writeable:

sudo mount -o rw,remount /

Edit the ril_subscription.conf (There are two files, the FP3.conf should be leading, but to be sure, edit both):

sudo nano /etc/ofono/ril_subscription.conf # and sudo nano /etc/ofono/ril_subscription.d/FP3.conf

Add useDataProfiles=true:

# Ofono configuration for FP3 [Settings] #EmptyConfig=false #Identity=radio:radio #3GLTEHandover=true #SetRadioCapability=auto SetRadioCapability=off emptyPinQuery=false radioPowerCycle=false confirmRadioPowerOn=false useDataProfiles=true [ril_0] transport=binder:name=slot1 name=slot1 [ril_1] transport=binder:name=slot2 name=slot2

Then save it, selecting the "Nano" keys at the burger-menu above the keyboard and tapping "Ctrl-X", then hitting "y".
If everything is done, reboot the device.

@domubpkm That's a good question, I didn't think to test that when I wrote my last post.

It seems to not accept MMS messages, I've yet to send one (It's been so long since I've used an OS that actually supports MMS that I've gotten out of the habit of using it), but as it doesn't accept them I doubt it will send them either.

So, to clarify my point more. As of July 2021 the Volla Phone can:

Send and receive phone calls Voice mail works Mobile data works (2G, 3G and 4G all tested) MMS doesn't work

On O2 in the UK.

@AppLee Thank you AppLee for notifying me. Yes, indeed I'm stil working on it and I'm focusing on the UI right now. I will release very soon an update, which will bring the ability to set thresholds and get notified when a threshold is overcome. For any request, please follow the link to the thread AppLee highlighted before, instead than replying in here, to avoid fragmentation.