I am on AT&T, grandfathered unlimited data plan and Next upgrade plan on my 6S Plus. I bought an IPhone SE, paid in full from Apple after trading in my old 6Plus. I use my SE as my daily driver after taking out the sim from my 6S Plus and putting it in the unlocked SE. I'm thinking of using Next to trade in my 6S Plus for a Samsung Note 7 when it comes out. I really want to try that S-pen. Question 1: Would I be able to pop the AT&T sim from my SE into the Note 7 if I ever decided to use the Note 7 as an actual phone for some reason? Generally I use my 6S Plus on wifi as a sort of iPod and daily planner and email device and I use it to record video and pics when I want to take advantage of OIS. I don't like using it as my phone because it's too big to have on me all the time. But it fills a niche at home. Next question: "What can I share between my SE and a Note 7"? Can I sync calendars between them? Can I sync my music playlists? I have both Apple Music and Spotify. How about Photos? I'm currently just using ICloud and Google Drive to store extra photos and videos that don't fit on either iPhone easily. I suppose I will have other questions but that's enough to start with. I never seriously used Android before so pardon my ignorance. We have old Android phones I've played around with for a day and I used a Nexus Tablet a long time ago. That's about it.