Fifteen-year-old Touya Mochizuki is accidentally killed by God. As an apology, God allows him to be resurrected, but since he cannot send him back to his old world, he instead reincarnates him into a fantasy world along with a single special request. Touya uses his request in order to bring his smartphone into the new world with him, which God modifies. As such, while Touya cannot contact his old world with it, the phone can be easily recharged by magic and can otherwise function such as accessing data from the old world and can use relevant features for his new world such as the GPS function to locations which are comprehensively identified on it.
just a worse version of konosuba lol (which is already a bad show in itself)