Joseph answers well; as usual.
Your question should have been posed as follows: “Do you turn off your phone on Shabbos and Yom Tov?”. By posing your question in the manner you did, it seems that you are looking for some form of existing survey or census.
In any event. I usually turn it off. If I get a wrong number it’ll remind-buzz me throughout the whole Shabbos.
-Leider