Not sure what to do here. My wife and I are on the same account. I am on a sub account with unlimited data. She got the Iphone 6 and is giving it to me so I can keep my data, and I am giving her my Iphone 5S Sim cards are the same. When I put the new sim card Verizon sent to her in my old 5S it worked perfectly. My old 5S had her phone number. However, when I put my "old" sim card into the 6 it keeps on saying "no sim". The sim is functional. I put it back in my 5S and she has the 6..at least for one day. Any idea why it would keep saying "no sim" installed? I reseated it in the tray 3 times to make sure it wasn't a physical issue with no success. Any assistance is appreciated.