1) No 2 phone browsers are the same.
Different Providers, and Different Phones, there are literally HUNDREDS of cellphone web-browsers out there.
Some have near flawless compatibility (iPhone), others can barely handle standard HTML (see: Verizon).
2) Implementing it with the forums would not be straight forward.
Making a "website" that'll work with most phones is very easy.
Making it so this forum is accessible through a cellphone would be a pain in the ass.
I'll look into it, but don't expect anything.