Kind of a watershed moment, here.
Mobile phone games tend to very rarely get re-releases nowadays, aside from the occasional exception such as The 25th Ward: The Silver Case, or Final Fantasy IV: The After Years.
There was an attempt at giving them consistent re-releases in the form of the "Appli Archives" series, developed by Hamster for Playstation Mobile.
But those were quickly made unavailable after Sony permanently shut down that service in 2015.
So with this being on a platform that is far less likely to abruptly shut down a few months after launch. Is a major step forward.
You probably won't recognize them, but this is the current lineup of titles.
フライハイトクラウディア
(Releasing April 16th.)
愛と労働の日々
(Releasing April 23rd.)
くるりん☆カフェ
(Releasing April 30th)
ビーチバレーガールしずく
(Releasing May 7th)
They're all priced at about 500 yen per game, and (in case it wasn't obvious from the text.) are only confirmed to receive a release in Japan. Though i'd imagine localizations are possible at some point. and even if they aren't, it's still reasonably easy enough to make a Japanese E-shop account and purchase them through imported Yen cards.