Question: Wiki via text message?

I have a question, if anyone can help…

A friend of mine came up with a great idea a couple of weeks ago. He wants to take a piece of information that is useful to Downtown Memphians (at least the ones I hang out with), which changes on a daily basis, and allow people to post that piece of information on a website. His idea is that the first person who finds out what this information is for the day would get on the site and post it… so, it would be like a wiki, in that anyone would be able to update the site.

However, I pointed out that most people don’t have computers in front of them when they gain access to this particular piece of information (although a few do). For it to really work, I told him, people would need to be able to send this piece of information as a text message from their cell phones, with some process in place on the back end to update the site to display the most recent message to arrive. I doubt the message would ever be more than 50 characters in length.

So, my question is, is there something out there I can use to set this up? I checked out Twitter, which can display info on the Web via text-message, but you have to register for an account and associate one phone number with it. That won’t work – the message needs to be able to be posted from ANY phone, not just a particular one.

So, anyone know of a service that combines text messaging with the capabilities of a wiki?