I bought a Nexus 4 from my brother, it has a Koodo SIM card. He got a new phone and is not using this one. I am currently a Koodo customer and have an older Samsung Galaxy Ace, but want to upgrade to this new-to-me Nexus. My SIM card from my old phone is the wrong size. Can I use his SIM card, as I have his permission to do so (and all the original paperwork from the phone purchase/plan)? Or do I have to buy another SIM card?