How to find out how many gb's my Iphone 5 is?

I just got a new iPhone 5 and i want to know how many gb's it is, how do i find that out?

Added (1). The phone is not activated, so i can't go into the phone until i activate it

Look on the back or go to settings> general> about and it will be on that list.

Go to settings then general then about and scroll down

Go to settings>General

Well if the phone isn't activated, then you can't, becauae fhe back of the iphone 5 doesn't have a gb logo.