Most people use their smartphone as their camera these days simply because it's inconvenient to carry two devices all the time. The best camera is the one you have with you, the old saying goes. Several companies (Olloclip comes to mind) have sought to solve this problem with camera and lens attachments for the iPhone.
Artist and entrepreneur will.i.am (of Black Eyed Peas fame) has released a series of camera attachments for the iPhone called foto.sosho with varying degrees of functionality.
The foto.sosho C.4 and V.4 (pictured) turn the iPhone 4/S into a legitimate point-and-shoot camera with a cool Leica-like vintage camera aesthetic. They feature a built-in flash, interchangeable lenses and the V.4 adds a slide-out keyboard for entering snappy photo captions even faster. The foto.sosho V.5 adds iPhone 5 compatibility, a 14 megapixel camera and a 5x optical zoom and is due later this year.
All three iPhone attachments work with the dedicated photo.sosho app (free, App Store) which allows you edit your photos, add filters, and upload them to your i.am+ profile and other popular social media sites. The C.4 and V.4 sell for £199-£299 in the UK and are listed as "coming soon" to other markets, including the U.S.