I've done everything I can think of, but I'm still only getting list information via email and not SMS. Under RTM settings, I have my mobile phone and Twitter activated (reminders and confirm actions are both set to on). I have added RTM as my friend at Twitter and my Twitter settings are Devices set to On. I don't know what else I'm supposed to be doing.

Following these instructions: http://www.rememberthemilk.com/services/twitter/

I am Twittering the following to RTM (note that I have a list named Grocery):
d rtm !gl grocery

I'm getting the list, but I'm getting it via email. To be frank, emailing a list is a rather silly option because if I have access to email then I could just go to the RTM site instead. The whole point of SMS is to both send and receive remotely, when not connected to the internet. Right?

If it matters, I have T-Mobile.

I also want to say one last thing. I do not wish to set up a filter in Gmail to forward it to my phone. I tried that already and T-Mobile is unfortunately reading it as a picture message, which naturally I have a limit on. I have unlimited text messaging though. So as you can see, this isn't an option for me.