I'm going to be purchasing a used Nexus One from a friend of mine. I already have a andriod phone, but I love the Nexus One, and the price is near to nothing. He'll be taking his SIM card of course, and I'll continue to use my current phone as my main. My question is, will I still be able to access the app store, download apps, and use the phone to it's full potential, minus calling, messaging, 3g, etc?