A horror trope that I very much enjoy is the "haunted book" -- a book that affects the reader in some way, like the Necronomicon driving people mad, or Dr. Mabuse's book that hypnotizes its reader into doing his bidding. It recently had a nice moment in the Magnus Archives, with the Leitner subplot, and there's even a hint of it in Frankenstein, when Victor reads the work of a scientist that his professors dismiss as nonsense and becomes obsessively deranged studying the subject matter.
So it's not that I think it's time for a revival and lord knows the word "reboot" has begun to stink of soulless profit (I think we're one, maybe two flops from a reboot of the MCU). I'm not the most current on horror media in any case so maybe it's been done, but if not I do think we oughta start considering the idea of a haunted phone app.
Apps are already designed for this, anyway. In our current era, a lot of retail "apps" are just reskinned browsers that load an optimized version of the company's website, and the goal of most apps and websites is to keep you in the app/website. (Which is why the google mail and tumblr apps both have internal web browsers.) A lot of phone games are designed to keep you in the game and continually redirect you towards microtransactions, and even apps that aren't games often gamify use; "gamification" has come to be a polite euphemism for "creating addictive circumstances".
Alongside this, a lot of recent cults and cultlike organizations have determined that straight religion is not the best way in anymore, and are coming in sidelong through MLMs (Nexium), wellness and dietary orthodoxies (Bikram Yoga, a number of insta/tiktok orthorexia gurus), or political movements (Qanon). So you get a cult, set up like a business, with an app you use for your business -- or even a cult with a "wellness" app that monitors your sleep, eating, location (wait, that's just FitBit) -- and slowly it gamifies you right into attempting to raise a Great Old One using the power of your downstream or a nice big helping of olive oil coffee.
Although I hate those thinkpieces/art pieces that are all about "you're so busy on your phone you can't appreciate the world around you, remember when we read real paper books" so I would require that the protagonist defeat the evil also using a phone app, or at the very least blind the evil using the flashlight function. Locking the book away in a library app and then putting the phone on airplane mode is a nice resolution, followed perhaps by it lighting up even though it's offline with a message "someone is attempting to locate this phone" as the post-credits stinger for the sequel.
This thought brought to you by Duolingo, which recently fed me, in succession, the task of translating from Italian the phrases
- Who do you see in the mirror?
- We open the curtains and see the light.
- The pillows and blankets are red.