I've been doing a lot of testing over the last month or so resulting in me returning a couple of iPhone's. There are several options to do this, I wanted to share my thoughts on which one turned out to be the best.
In my experience returning it in store (if you are within a drive to the Apple Store) was the best. It's important to make sure you return it
- With the original box
- With the original accessories
- Totally restored iPhone
- No inserted SIM card
Take your receipt, it will be either the printed one they gave you or the email that was sent. The email will contain a PDF.
This method worked for me with the least amount of hassle.