If you're deliberately making yourself hard to contact this way, a lot of people will just stop calling you.
Though with people of my age "cold calling" isn't all that common, typically you text the person first to make sure they are available and keen on a call. Unless it's an emergency of some sort, of course.
I would say I am pretty privacy conscious (when possible), so this may not be the average person's experience.
Phone spam is much more harmful than ads you kinda-sorta opt into, IMO.
Lots of influence from Greek culture in Georgia for sure. For a fun fact, the Georgian for "Greece" is saberdzneti -- the land of the wise. Berdzeni itself means wise (as well as Greek), but I'm not certain if it's derived from an alternative historical name for the Greek.
Friday and Sunday get different names, unrelated to Sabbath as far as I can tell -- paraskevi and kvira.