IPhone 4S to 5s and keep the same number?

I'm currently a vodaphone customer with an iphone 4s wanting to upgrade to the 5s, when I upgrade online and the phone gets sent to me will the 5s nano sim have the same number as my current iphone or will my number change?

It should be the same. You have to put in all your current info and stuff. It might be more helpful to go to an actual store.