More than 400 million iOS devices are currently in circulation, and the range of accessories for designed for iPhones is constantly expanding.

With the holiday shopping frenzy just around the corner, retailers are pulling out all of the stops to lure iDevice fans. iDevice accessories. But before you head to your favorite store, take a look at the top iPhone accessories that have become popular among iPhone fans:

• Quad Lock - iPhone Tripod Adaptor

While this iPhone accessory can prove useful to any iPhone user, its main fan base is likely among those constantly uploading iPhone pictures to Facebook and Instagram. The Tripod Adaptor allows iPhone users to securely mount their smartphone to any standard tripod with just a simple twist. It is designed to work well for video, low light, as well as time-lapse or panorama photo apps. It requires a Quad Lock iPhone case, and it only comes in black. The Quad Lock Tripod Adaptor is available for purchase for $19.95.