I will be moving from an iPad Air 2 to an iPad Pro. Currently my iPad Air 2 is on my AT&T wireless mobile share plan. It has the Apple Sim Card installed. When I get my iPad Pro, all I need to do is simply swap the sim cards between the two devices right? This would move my data plan to the iPad Pro, and the iPad Air 2 would have a fresh sim card for the next user when I sell it. Would this work? Do I even need to call AT&T to let them know what I'm doing? Thanks.