When designing an iPhone 4S case, what dimensions should I use?

I'm going to use a custom iPhone case like CaseApp or Zazzle and I was wondering how big the image I create will need to be. What dimensions should I use?

Take the iPhone's dimensions in inches, and multiply them by 300.
This gives you the minimum amount of pixels you'll need. The bigger the better.
(300 dpi is the commonly used minimum printing resolution, and is mentioned by zazzle in their FAQ)

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