You basically have to create your own files to do all the basic things you need to do on a forum...
Basically your own mobile version of forumdisplay.php, showthread.php, and index.php. That would give you the must basic ability to read data... it will get more difficult quickly if you need to include user permissions and ability to actually post.
FYI to my knowledge the popular vBulletin mobile apps were created by TEAMS of coders, not one person. This isn't going to be an easy project.
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