Reachmahjong.com

A nice riichi app for iPhone is available. I only played it a few times, the robots seem fairly defensive, the game is nice for training since you can play two winds very fast. It has dora, ura dora, kan dora, kan ura dora and ippatsu. Red fives optional. It claims to play with furiten (lost hand) but it doesn\'t seem to work properly. Highly recommendable.

http://itunes.apple.com/WebObjects/MZSt ... 09246&mt=8

I\'m gonna have to trick my younger brother into buying that for his iPhone so I can try it. lol

Not sure how many of you are aware of this list.
http://www.dipching.com/iOSmj.html
94 true mahjong games for IOS, (lots of riichi mahjong)

I have tried a multitude of these (mostly the free ones) before narrowing it down to the 4 that I use.
1.Professional Mahjong Kiwame--Athena................. (viewtopic.php?f=18&t=53059)
2.Mahjong Nagomi----Zoo
3.銀麻 雀 天極牌----Hangame
4.一 人用4人打ち麻雀----NHN Japan Corp................. (don't think this is available anymore)
additional info on the first 3 can be found in (viewtopic.php?f=5&t=53180#p56449)
Mention of some of the others are here.
viewtopic.php?f=18&t=52938#p54667

Janryumon mobile apparently no longer exists as of earlier this year, if people have noticed already.