This is a simple and easy solution to improving smartphone cameras. The rubber band lens will fit over any smartphone and can be removed in seconds. Unlike many of those bulky lens adapters that require a special case, this just requires the rubber band its attached to.
It’s a clever solution and something that is very easy to remove when not in use. I typically use my DSLR when traveling for 90% of my photos but I like the handiness of just using my iPhone (which is finally gotten a lot better with the 4S). So adding this strap can make the images even better with your smartphone. When you are not using it simply put in on your wrist for safe keeping.
Its only $15. Get more info at their site Photojojo.