Phone slots are slot games designed to play smoothly on your mobile device....

https://www.booknose.win/phone-slots-are-mobile-friendly-slot-games-that-use-a-random-number-generator

Phone slots are slot games designed to play smoothly on your mobile device. Before trying them, check that the game uses a certified random number generator (RNG) and offers a clear return to player (RTP) percentage and volatility info