[1.1.2 OOB]Wi-Fi can't connect

I know this might be a non related iPhone issue but it still want to know...

When I walk into my house, Wi-Fi goes active and everything works perfectly.

When I walk into my campus, Wi-Fi goes active and everything works perfectly
except YouTube. That's because my school doesn't let you use it.

When I walk into my job, Wi-Fi goes active and NOTHING works. Safari, Mail, YouTube, nothing that uses Wi-Fi. I get a "Safari can't find the server" instant message.

When I walk into another school, Wi-Fi goes active but again, NOTHING WORKS.

Does it has to do with the local servers' permits?
or is my iPhone too lazy to use Wi-Fi? :rolleyes

thanks in advance

i have the same problem between my work and my house