To your last point that’s why if you remake something it’s best to either acknowledge the new tech, incorporate it somehow, or make a retro movie like this looks.
Cabin in the woods and you’re next pulled off the cell phone thing perfectly. One used meta jokes and the movies construct to kill them off and another used the lack of cell phone service as a plot device and something to be paid off at the end of the movie.
I’ll be interested to see how they incorporate it into Halloween, which clearly takes place in 2018