I have a 16-month-old son, and most days during lunch I set my phone on my desk and use FaceTime with him while he eats his lunch. Each day I find a different way to prop my phone up against a stack of books, which never works as well as I think it should. I designed this stand so I could look forward to sharing lunches with him, without having to find a place to set my phone.
The tetrahedral design is light but stable. It does not tip, and it works well in both portrait and landscape orientations.
I designed the stand to fit the Otterbox Commuter case for the iPhone 4S, so the cutout on the base is 1.6cm deep. The stand works for naked iPhones as well, and should work on any phone or case up to 1.6cm thick. (If you want a stand with a different size opening, please feel free to leave a comment below.) I also have a smaller version available for a naked iphone 5.