I use an Otter Box case for my iphone, but it will be the last one. The double protection design concept is good, but there are some caveats. Once the plastic window gets a bit worn from use, it takes away from one of the great assets of the phone, it's display. When the original holster broke, I called and they sent me a complete replacement, not just the holster. But lo and behold, that one broke too because it is just a poor design with cheap plastic, and no real spring to hold it's form. Probably the reason they're so willing to replace it without hassle.