We actually wrote a little guide about that exact thing :) Read how to 360 here Long story short, there are a bunch of 360 cams & we support them all. There are also a couple mobile apps that will shoot a proper spherical image that we can also use. Once the photo is on your phone / camera roll, you'll see it in VR.
If you have a question / comment / concern, etc we'd love to hear from you! You can always reach us directly at firstname.lastname@example.org