Strange... I tested earlier... 3G was working when everyone said it was down.
Now my phone is on Edge... still works.
In midtown NYC.
It's not an iPhone btw.
I'm suspicious that this really is iPhone related and the other phone or two is unrelated typical signal issues.
I think everyone is just oversensitive and assuming the entire cell grid is down. Seen several people with cell phones... no issues. No iPhones though. The trend is certainly interesting.