Hey everyone. First time poster. I bought an iPhone 6 on launch day and am having regret and want an iPhone 6 Plus instead but i'm past my 14 day return window. AT&T is annoying as expected but I ordered an iPhone 6 Plus from them directly and had to choose that it come with a new number. I am going to sell my iPhone 6 to my nephew and keep the iPhone 6 Plus for me. My question is, can I just put the SIM card from iPhone 6 into the iPhone 6 Plus and call it a day? Will it work and be activated or do I need to something else? Also do I first need to activate it with the SIM that comes with it (the one with the new number) or just swap out the SIM before I ever activate it? Thanks for your help. I look forward to hearing from you.