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Orangemonkie's Foldio takes smartphone photography lighting a step further. The Foldio is a collapsable, mobile lighting backdrop -- complete with magnets to seal its shape and an internal, embedded LED lighting strip. If a standard white backdrop doesn't take your fancy, you can switch sheets to various colors, and the premium version is equipped with two LED strips.
Price: $49 - $59
USBFever lens kit
Available on Amazon, USBFevers' smartphone lens kit comes complete with a fisheye, wide angle & macro lens, as well as telephoto lenses of varying zooms. The lenses can be attached via an iPhone 5 cover.
Although I don't often use tripods, I always have one or two stowed away for special occasions -- including one suitable for my handset. Joby's GorillaPod tripods are a cute, bendy option -- light to carry and bendable. Coupled with a remote shooting app, you could hook your smartphone in any variety of positions. The GorillaPod range supports everything from mobile devices to full-sized DSLRs.
Price: $19.95 - $99.95