What does it mean when you are unblocking or unlocking your iPhone?
Note that unblock and unlock are used synomously throughout this article.
Apple signed a contact with AT&T Cingular where only AT&T Cingular had the exclusive and authorized right to be dealers to sell iPhones with a phone contract. Because of this contract between the two [...]

Unblock Facebook
Is your school or work blocking sites like Facebook, MySpace, and YouTube?
When you try to access your favorite sites such as Facebook, it may be blocked if it says “Internet Explorer cannot display the webpage” or “Address Not Found. Firefox can’t find the server.”
Why do companies or schools block sites like Facebook?
Businesses block access [...]