I came from Samsung too. Some things took care of themselves. I have photos saved to Google Photos & music saved both to my computer & a cloud service. So those were easy to get. Plus, contacts are backed up through Google. I did initially use the LG Back Up app. You can download the app to your S4 from the Play store and transfer data through NFC, I believe it was. I don't recall everything you could transfer via this method, but it seemed a little finicky and I had to restart it a few times. Hope that helps.