Lots of annoyed iPhone users today in the central US. Apparently, the servers responsible for running the EDGE network for AT&T are down, depriving many iPhone users of their normal connectivity.
This outage is affecting users from Chicago to Kansas. If you're part of the affected customer base, let us know in the comments. According to poster BBuehner at the Apple Support discussions forum, AT&T says the problem should be fixed by the end of today but could go as long as February 5th.
Thanks Rick Kaczanko