I'm going to have to use my old iPhone 4S as my main phone until Monday. The phone has the SIM card inside of it right now, it's just not activated (T-Mobile). All I have is the phone with the de-activated SIM card inside of it. I don't see any numbers to refer to in terms of re-activating it, though. Will it be possible for me to use this phone as a temporary until my new phone arrives Monday? Or am I sore out of luck here?