I purchased an iPhone X from Apple (Verizon) and paid full price on their app. I set up and activated the new phone with the new SIM that was included with the new phone. Now I have to return the phone. Can I just take the new SIM from the X and put it into my old phone and keep it? Can I send the X back without a SIM or is there a process I have to go through to take my number off the new SIM and put it back on the old one? I would appreciate input only from those who have done this before and not guesses. Thanks.