I haven't purchased a new iPhone since the 6 a few years ago but am going to take the plunge on an 8 Plus. In the past, I have purchased in full from my provider, AT&T. With the IUP, though, I'm a little confused as to what I should do. I like the idea of paying in installments but I'm unsure of AppleCare+. In short, how does the IUP work?