We have features a number of different cases for the iPhone here at Geeky Gadgets that let you carry money or credit cards with your smartphone, but if you are looking for a simpler solution then it may be worth having a look at these Poddities add on clips for the iPhone 4 and iPhone 4S.
The Poddities is a money clip that can be added to the back of your iPhone, and as you can see from the photo below it is screwed onto the bottom of your iPhone using the existing screws on the device.
It seems like a cool idea if you want to carry your cash around with your iPhone without having to carry a wallet, if you want one of these Poddities money clips for the iPhone they are available for $33 each from Strapya World.
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