Oh, I forgot about the original message. I post from my phone to my site quite often.
Unless there is something I’m missing posting by SMS is kind of blah.. I don’t know why would you want to post by SMS when you can easly post by sending an email from your phone? Simply use one of the mobloggin plugins out there and you’re all set. Hell, there is an option already buildin for doing that right in the WordPress setup.. ??
Plus you don’t have to worry about the SMS lenght limit.. ;p