If you follow the links I gave you would see that this is possible too
-- it's all part of the same system. My response what perhaps not
clear enough.

http://help.twitter.com/forums/59008/entries/14014

But it's rather more important (and less expensive) to tweet a rare
bird rapidly regardless of how you receive tweets.

Twitter also has a location aware API coming up that would enable you
to follow tweets based on a location rather than a hash tag (all
tweets from the Fill, for example).

On Aug 31, 2009, at 11:03 PM, Charles Swift wrote:

> My question was not about sending twitter updates ("tweets") via
> text messaging (yes, I realize you can do this), but rather can you
> receive "tweets" from others via text messaging on your cell phone.

--
Kevin Purcell
kevinpurcell at pobox.com