This game is out in Japan and uses a cell phone while I doubt we'll ever have it over here, there is a trailer for it on the second disc of the special edition of Advent Children that's comming out in the states on the 25th of April. It looks really cool but as from what I've seen on the internet when I went searching, there isn't much hope of it comming out here. The most hope I have is that since they had the trailer on the DVD they might bring it over. Before Crisis is about what happened in the six years leading up to FFVII. It seems to be mainly Shinra based and stop lights the turks rather than AVALANCH.

Sites to look at about BC:

http://www.square-enix.co.jp/mobile/bcff7.html
http://wireless.gamespy.com/wireless/before-crisis-final-fantasy-vii/550235p1.html
http://www.ffshrine.org/before-crisis/before-crisis.php