There's some fine-print to the shoutbox/chat script rule; the fine print is the script has to be ran on x10hosting for it to count.
There's locations such as
http://cbox.ws/ which provide chatbox services for sites like ours that don't want the system getting clogged with input. THOSE kinds of chatboxes are fine, because it's their resources it's using, not ours
But can you explain more what you meant by mobile chat sites? Just wanna make sure what you're thinking is what I'm thinking you mean, cause if not it might not even fall under that part of the TOS.