If your phone has a flat back you can use the kowa adapter.
All you need is a cheap plastic cover for your phone, and then you move the metal plate from the one it comes with. It is self-adhesive and if you pull slowly it comes off and can be put on any flat cover.
Just get the one that fits the best, camera in the corner or center of phone.
I got one long ago for an IP5 because I had an android phone with the camera in the corner just as the Iphone. Since then I got a Samsung with the camera in the middle, and it looks a bit silly but it still works ;-)