I liked the idea of the story - pranksters get pranked as revenge for their antics but it just turned into another unrealistic slasher. Gregg Sulkin is the worst actor in the movie ....considering he is the main protagonist !!! Garrett Clayton was not much better and the acting is very forced and wooden. Not particularly scary or gory , or maybe it was but the bad acting just over shadowed it. In all , not a terrible movie, but forgettable.

I really really really wanted to like this movie! Great concept, great suspense, even a decent script. However, terrible execution. I still did enjoy it, just was hoping for more.

I can spend hours on YouTube, clicking one pointless but entertaining compilation video after another. They have compilation/montage videos of pretty much everything you can think of, and naturally many of them are edited from famous movies, like explosions, car crashes, etc. Just type in whatever random key word in the search field and add the word "compilation"! Why am I writing this? Well, because "Don't Hang Up" reminds me of these videos! This whole film actually feels like a compilation of literally ALL the dreadful clichés and stereotypes that have been overused in slasher movies since the beginning of the genre! This would be awesome if it were deliberately intended as a spoof or an overlong joke, but I suspect that everyone involved in this production considers "Don't Hang Up" a dead-serious and adept career achievement! I dare anyone to find a movie with more clichés. It already starts with the title; - another "Don't!" flick! Between the mid-seventies and early eighties, "Don't" titles were extremely popular and we had masterpieces like "Don't Go in the House", "Don't Answer the Phone", "Don't Open Till Christmas", etc… Then there's the plot. Juvenile phone pranks, are you kidding us? Half of the '80s slasher oeuvre revolves on films where some stupid prank goes horribly wrong and the victim or his/her relatives subsequently take bloody vengeance. "Don't Hang Up" recycles this ancient premise and doesn't add anything, except of course the use of inevitable social media like blogs and smartphones. Moving on to the characters then… If you think that dumb and irritating teenagers only existed in the 1980s, this movie definitely proves you wrong. The pranksters here are guaranteed the most loathsome protagonists you'll ever see. From the very beginning, you'll choose the side of the unknown killer and hope that he will butcher these idiots in the most excruciatingly painful ways imaginable. In order to make the stereotypes complete, they are also miserable cowards who betray each other and sleep with each other's girlfriends. Now, I certainly don't want to sound too arrogant myself and I'll gladly admit that I still prefer watching brainless and straightforward slashers like "Don't Hang Up" over pretentious and wannabe art-house horror flicks. Although 200% uninspired and forgettable, this film at least isn't boring and kept me awake at 4am in the morning after a long day. With a derivative plot and zero suspense, the makers should have been focused on a higher body count and more gruesome killings, though.

Don't hang up is a brilliant Thriller mystery that is just amazing, don't let the ratings persuade you , this movie is a must see , the story line is great, the acting is OK, sometimes the characters get annoying,but all else it epic , theirs great suspense and twists and the killers voice is amazing .