Q. Can one wear an Apple 3 watch on Shabbath that has internet and phone connectivity, when those features are turned off and only the time and temperature shows?

A. Although YalkutYosef (4: 51, p. 213) Shemiras Shabbos Kehilchoso and others (see above question) permit the use of computerized watches, they refer to the basic models of yesteryear, not the complex ones available today.
Horav Shlomo Mille’s Shlit’a opinion is that one should avoid using them, even when all features are off and the buttons taped. The reason being that they more resemble and are used as a digital phone or mini tablet, than as just a permissible time piece.

Rabbi A. Bartfeld as revised by Horav Shlomo Miller Shlit’a