This does look a little bizarre...

  Random blog claims free phones for students.

  Links to official rules PDF hosted on some PHP dev site.

  You have to register on Facebook to participate.

No indication of Microsoft being involved, yet you're disqualified if you've previously gotten something else through a Microsoft student promotion. What?

There's a similar contest in India.

http://www.microsoft.com/india/iunlockjoy/

Perhaps it's being managed from India.