There are many classic games like Tetris and pong, game console emulators like Nintendo and Sega emulators, and popular mobile games like Clash of Clans and Pokemon Go which work on smartphone and tablets, so I can see many people still using a smartphone to play games if the smartphone becomes less popular like land line telephones because another type of communication device like a robots with a built-in PC, screen, mic, keyboard and speaker becomes more popular for electronically keeping in touch with people.