DIFFICULTY: EASY
Most of the time Google index your wap2 site istead of the main forum or sometimes index both whereby causing duplicate content... Now to stop Google from indexing your wap2 forum is quite easy using your sites Robots.txt
Just include the below code in your sites Robots.txt
User-agent: Googlebot
 # Don't index mobile versions
 Disallow: /index.php?*;wap
 Disallow: /index.php?*;wap2
 Disallow: /index.php?*;imode Thats all

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