Yep! If you dont use emulators on your mobile phone for whatever reason (and even then emulators for later Sega consoles are to slow or simply not available) then you may be happy to hear you will get to play many classic Sega games from many Sega consoles on your android or IOS device...for FREE! (in game ads which can be removed via in game purchase).

Quote Originally Posted by Gamespot
Sega is bringing a catalog of its classic games to mobile devices via a new service called Sega Forever. The service will encompass titles from every era of Sega consoles, including Master System, Genesis, Game Gear, Sega Saturn, and Dreamcast.

Each game available through Sega Forever will be free to download and features in-game ads. Like the recent mobile release of Crazy Taxi, however, players have the option to remove the ads via a $2 in-app purchase per game. Every title will also support new features such as leaderboards, cloud saves, offline play, and controller support.

The first batch of Sega Forever titles goes live worldwide tomorrow, June 22, and consists of the following five Genesis classics:
-Sonic the Hedgehog
-Altered Beast
-Comix Zone
-Kid Chameleon
-Phantasy Star II

The service will be updated with additional titles every two weeks, according to a press release. Each Sega Forever game will be available to download individually on Android and iOS devices from the Google Play and App stores.
Source

Official page here: http://forever.sega.com/