The mobile phone that has no signal is one of the most overused clichés in modern horror.
This montage of various films over the last decade shows just how common it has become.
Obviously it is a quick fix for a screenwriter trying to get around the logical problem of worried characters calling for help.
But how about an original premise that inverts this cliché, whereby having a signal is a major problem or dilemma for the main characters?
Just a thought.