How do I internally check if my phone is a 4s?

[sad disease]

I just received my iPhone 4S. It came in its box with the manual and everything However, when I hold the home button Siri does not show up, it simply goes to voice control. How can i check if this is actually a 4s?

edit: oops that was embarrassing.. the reason I was so suspicious is because when I loaded up the phone there were different emails connected to the phone already

 

[rockyroad55]

You have to turn on Siri. General, Settings, Siri.

 

[Type X]

You have to turn on Siri. General, Settings, Siri.

 

[Dubthedankest]

From your thread title I thought you stole some kid's phone.