What OS is running on my phone? I'm not even joking ...
So ... I thought* I'd updated my Meizu MX4 so that it ran UBports rather than the original software. How can I check that I did this? At the moment in the "About" section I've got: Ubuntu 15.04 (OTA-15). The more articles and topics I read the more confused I'm getting!
*this was perhaps about six months ago and I've been unwell since.
@happyzenith that sounds like Ubuntu still. It should be
Ubuntu 15.04 (r3)for last update in the stable channel.
There's a Telegram group  to help you install UBports and to avoid any kind of confusion or headache.
Also see https://ubports.com/telegram-welcome for a list of other helping groups.
Get well soon!
@happyzenith Yes, OTA-15 is still Canonical image, you should change to UBports soon
Thanks ... my poor brain is fried!
I'll be sorting my phone out ASAP ... only realised when someone on https://ubuntuforums.org/ told me when I was trying to do something else. I bet they thought I was completely mad!