Just a word of caution. I wasn't aware of the restocking fee that applies to late returned iPhone under an Apple care plan. Be warned and be aware of this.
I have an Apple care warranty for my old iPhone 6 Plus. Under the care plan they can send you out a replacement phone while you send them back the broken one.
If you're longer than 2 weeks, as I was, they charge you £599 for the replacement cost.
If you do subsequently send it back this is subject to a restocking fee of £166 and they refund £434.
So this is a warning, if you're sending it back, make sure you do it within 2 weeks!
I now have an iPhone 7 plus with an apple care plan. I hope this helps someone. Better to know this than not. No one from Apple told me in advance when I did this. This wasn't done online, but over the phone. It was in the agreement somewhere, had I gone through the terms and conditions.