SMF is written in the popular language PHP and uses a MySQL database. It is designed to provide you with all the features you need from a bulletin board while having an absolute minimal impact on the resources of the server. SMF is the next generation of forum software - and best of all it is and will always remain completely free!

SMF was launched in 2004 and seems to be rapidly gaining popularity as a forum platform. Available in 21 languages, SMF is highly customizable with many themes and mods available. Users have given SMF very good reviews, citing it's ease of installation, administration and customization.

With the built in mobile support it can be opened thru wap browser. With these embeded feature your forum can be opened anywhere with ease using cell phone. You can make, reply, edit, or delete post even in wap browser. The different is you can’t acces the admin area and the appearance will be simplified. You didn’t need to set this feature its activated by default.

Source :

http://www.simplemachines.org/

http://wapreview.com/blog/?p=156