I'm planning on ordering a 6s Plus after I return back to the country next week. I'm currently on AT&T and have no reason to switch (I'm happy with my service). I'm trying to decide if I should do the Apple Upgrade Program or AT&T Next. I'd like the one that gives me the most painless process to upgrade my iPhone each year. Like I said I don't really see myself wanting to switch carriers but I'm not sure if there is any other advantage to Apple's program other than being free to switch carriers.