Are you at a Starbucks or at another AT&T wifi hotspot?
On Sunday, I was at a Starbucks, and instead of my iPhone just signing in automatically (as it has done over the past few months), the Starbucks wifi log in webpage appeared, and I couldn't connect.
Someone just put in your number for an ATT hotspot, or you did. That is the verification text they send when you connect to ATTwifi to ensure you actually have att.
nope, I'm at work at my desk where I always am during the day.. although starbucks are popping up everywhere, so its possible that they built one out front today while I wasn't paying attention
The friend of mine that I sold my 3g to when I got the 3gs is using it jailbroken on t-mobile and he was seeing if typing in my number would allow him to use wifi at starbucks..