IPhone 3G WiFi strange behavior

Hi
So i got an iphone 3g just recently. I Activated it and updated to 2.0.1. Then i started playing around with it and found out that wireless networks get discovered and displayed but i cant join one of them (altough i know the credentials).
So the first network is the one at home (Netgear MR814v2, 802.11b). I started with mac-filtering and wep, didn't work. (Couldn't connect to the Network "..."). Then i turned every security feature off but i still couldn't connect.
I tried eduroam at my university which is probably wpa(1 or 2)-enterprise secured. i get asked for username and password, the phone tries to connect but nothing happens (no error, no success).
Next were the 2 WiFis at work, both unsecured - one uses VPN, the other authentication via www. Couldn't connect to either network.
Then i tried to connect to a shared ethernet network from my Powerbook. Still couldn't connect to the network (with above errormsg).
Finally i created an adhoc-wifi-network. I could connect to that one (after assigning the ip-addr manually. Then i was able to ping the iphone which was responding as expected. Sadly i couldn't use the adhoc-network for anything useful.
I checked the logfiles using the Iphone Configuration Utility and there was an error "-3" but i have no idea what that means or what i can do about that.
I already tried rebooting, reinserting the sim-card, resetting network-settings and all settings, as well as a restore via itunes but nothing helped.
The weird thing is, all networks get displayed and technically Wifi is working (because i can connect to the adhoc network). Is there anything i can do besides taking it back to the mothership and ask for a repair?

Hey alecamused,
Try Resetting Network Settings on the iPhone. Go to Settings> General> Reset> Reset Network Settings.
This article provides other common Wi-Fi tips.
http://support.apple.com/kb/TS1398
Also, you can restore the iPhone and setup as a new phone to rule out any issues with the iPhones software. http://docs.info.apple.com/article.html?artnum=305744
Jason

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