I've tried a few times over the years to make Ubuntu Touch work. God how bad I wanted it to work here in the US. The lack of apps and VoLTE support really soured me on it ever working here.
If you're outside of the US, the availability of useable mobile OS's outside of Android and iOS is pretty abundant compared to the situation here in the US.
If you're outside of the US, the availability of useable mobile OS's outside of Android and iOS is pretty abundant compared to the situation here in the US.