After coming across this nice little video, I just had to share this with all of you guys:
It is quite the cop out: no cell reception. But it makes sense in a lot of the movies because of the location. I am not mad because if you didn't insert that one little line, then everyone would ask, "Why don't they just use their cell to call for help?" It's a bit of a crutch, but it's rather essential to most of the movies. Any thoughts?