How to switch my current iphone plan to my new iphone?

I broke my iphone and now i'm getting a new one from a guy online, i didn't have a simcard with my old iphone so how do i go about putting my contract on to my new phone?

Added (1). The Carrier of my old iphone is Rogers as well as the new one online that i'm getting, they arw both on Rogers

Take the phone into Rogers, tell them what you want to do, explain what happened, they'll give you a new SIM card ($10-20) and they'll activate the new phone on your plan (usually about $10-25)