I had A WiFi issue on a virgin 3G, but no one will EXPLAIN "the" WiFi issue BlackSn0w supposedly causes for anyone experiencing my issue to corroborate. They just keep saying "the" as if everyone experiencing it knows what they are talking about, even without being BlackSn0w-related.
Well, the backup and restore data loaded on the "virgin" 3G came from a previously JB'd 3G, but it was a 3.0 beta phone JB'd long before BlackRa1n and BlackSn0w were around and the problem remained even after a reloading a full virgin FW w/o restoring a backup. The phone was never unlocked (neither was the phone the backup came from).
My issue: No access point visible, even when standing next to one and in rang of tens or them. But strangely, it's not so cut-and-dry... If I felt like running my battery dead for no reason, I *may* see the prompt for a random hotspot once a week or so. It co tinued doing it even after resetting settings and restoring firmware. Because my phone was reaching the end of it's warranty when it was replaced withthat defective one, I held on to it and lived with it that way for the duration of my 3 month extention so that I could get another. They didn't like that at the Apple Store one bit! It wasn't too bad because WiFi interferes with A2DP and vise versa on the 3G (try streaming YouTube or Pandora). It meant tolerating really crappy-looking versions of YouTube videos even when I was in-range of WiFi and not using A2DP though.