(Crossposted, please feel free to trim groups)
Just in case this has not been posted to USENET yet.
The 3.0 update plagues some Apple iPhone 3G users with both of the following conditions.
No Wi-Fi Bluetooth Unavailable
Apparently it also has to do with short battery life that I and several posters in that thread are experiencing.
This issue is not to be confused with poor Wi-Fi connection speed, the problem is that Wi-Fi and Bluetooth are totally unavailable.