Are you an iPhone 3G user with a “No Wiki” greyed out on your settings? Do you see this when you access your phone’s settings?
For me, I’ve only seen it once. I have a first-generation iPhone. The solution and fix for this problem was simply to do a soft reset by holding down the top power button and the home button until it restarted, at which point the wifi was working again. As another point of reference, I use FIOS and have the ActionTec router they supply.
You should also check out iPhone WiFi Problems (aka greyed-out “No WiFi”) from earlier this year, where he indicates that for him, it was a hardware failure:
I have to say, after hours of working through all the things other people have tried, I am finally at the same place – I am pretty convinced that my colleague’s iPhone at least, is also a solid hardware failure.
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