It translates to “free of charge” or something to that end.

Ubuntu is a Bantu (broad language family of about 600 African languages including Zulu) term meaning something like “humanity” or “community”

Near as I can tell, Granel is borrowed from spanish and in isolation would mean “grain”

If you want to keep the phone, a custom rom will get you up to at least Android 13 : LineageOS for S9