Question about Ubuntu and other Linux distributions as cellphone OS

[Bret Busby]

Hello.

After having just found and read the news report at
https://www.abc.net.au/news/2024-10-30/google-could-be-split-up-as-search-monopoly-challenged/104473276 

which includes reference to monopolies involving google and android and 
apple and its cellphone stuff and corrupt things with apple and google 
and safari, I am wondering as to what degree, Linux, as Ubuntu or 
otherwise, is available as an OS for cellphones, and, whether it can be 
installed on cellphones that have another OS as the default OS.

..
Bret Busby
Armadale
West Australia
(UTC+0800)
..............