If you are unfamiliar with this type of game, you find a phone and look at all the stuff on it to solve a mystery (basically). I find them pretty fun, but there don't seem to be that many of them. The ones I know of are on sale now, though, thanks to the Visual Novel Fest.
store.steampowered.com
A two game bundle that only costs $1.32
store.steampowered.com
This includes the first two Simulacra games plus a Doctor Who found phone game. I can't see what it costs because I already own two of the games. Of course, they can be bought separately for slightly more. The Doctor Who game is not on sale, but is only $5.99 minus the bonus for the bundle
store.steampowered.com
This is all 3 Simulacra games. They are all on deep discount. Again, though, I can't see the total price.
store.steampowered.com
This one is not on sale, but only costs $3.99 and has a free demo.
Save 72% on Lost Phone Stories on Steam

Save 45% on Pick Up The Phone Collection (Ft Doctor Who) on Steam

Save 59% on Simulacra Trilogy Bundle on Steam

Trials of Harmony ~ A Found Phone Mystery Visual Novel on Steam
What would you do if you suddenly found yourself quarantined within an underground nuclear facility, isolated, and forced to play a series of death games alongside a group of strangers...?