One of the (many) things the iPhone 4 has over the 3GS is a built in flash. It’s annoying to take pictures in dim or dark conditions. Fortunately, there are a number of solutions – a number of LED lights are available for the iPhone, either built into protective cases or added on via the docking port.
I chose the latter. That way I could keep my Hipstamatic case and not have to worry about modifying ANOTHER one so the lenses were more or less level. The flash can go on my keychain with the lenses when I’m recharging the phone. Plus I think it looks cool this way.
The picture is dark because of the lens I chose to shoot with, was trying to get myself mostly in shadow.