If you've just gotten yourself an iPhone and are unfamiliar with what the hell Cydia is, here's a little breakdown: Cydia is a software application that lets you install applications and software packages on a jailbroken iPhone or iPod Touch.
Cydia offers most of its applications for free, though they do have a Cydia store where you can purchase special apps. If you're looking for a way to personalize your iPhone without spending a single penny, check out this tutorial on how to install themes using Cydia.
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