Cannot connect to this WiFi network :( Help!

[smallx]

Okay so there's this WiFi network at school. It is unsecured, and my teacher always connects to it. On my iPhone 3G it never shows up, though after I scan for networks using Stumbler (Stumbler says it's not hidden btw) it appears in the settings. So I click on it and it says "Cannot connect" (or something along those lines) and after the third try it disappears again. I tried using SpoofMAC to spoof my mac address to 11:11:11:11:11 and that didn't work.
Please all help is greatly appreciated! Thanks

 

[Gav2k]

The wifi network proberly uses mac address filtering hence why you can't join it.

 

[smallx]

The wifi network proberly uses mac address filtering hence why you can't join it.

So there is nothing that I can do?? (I already tried spoofing my mac and that didn't work)

 

[Gav2k]

Spoofing won't work you'd need to cloan and existing verified address

 

[smallx]

Spoofing won't work you'd need to cloan and existing verified address

Is it possible for me to scan for mac addresses on my iPhone 3G, so that I can find my teachers mac addresses and change it to mine?