My wife and I are both getting the same color and size for the iphone 6. How exactly will I be able to tell them apart? Also, ordering from verizon, do these come with new SIMs? We are existing customers with iPhone 5(s).
I'd suggest either two different cases or wallpapers (or both). Mine did, it was in the SIM tray waiting for me. Activation was taking forever so so I took the one from my 5s (which was just replaced in July because the last SIM had issues) and it activated right away. Neither SIM looked different, so don't let someone tell you it holds NFC or something. It doesn't. I also confirmed this with Verizon. The other SIM card worked fine in the 5s so no worries about swapping them.
By the imei number which should be listed on your account, and imprinted on the back of each phone. You can try calling one another after activation. New SIM cards will be inside the phone.