Well, if you have a cellular phone that has internet capability, you can browse SMF forums. It's rather nice. I'm lucky enough that the place I work pays for an unlimited data plan on my work phone (for mail, server alerts, tethering in remote locations).
Just add "?wap", "?wap2", or "?imode" (for DoCoMo peeps) at the end of the main URL for any SMF forum. You can do it in a standard browser if you want a "lite" mode for posting, or are just curious.