MobileEnthusiast has a great 10 year look at the history of games and content on are beloved mobile devices. It all started in 1998-1999 with the Nokia 5110 which used ASCI characters (ASCII SMS) to make logos and little animations. While not games per se, they did provide foundation for things to come.
Jumping ahead to 2009+, they predict Ringtones and Wallpapers disappearing as they will be free - which I mostly agree on as who pays for Wallpapers now anyway? Additionally, premium paid content, adult content, ad-funded games
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