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DataMonitor is another "does what it says on the tin" applications, by monitoring exactly how much data you use on your iPhone, iPad, or iPod touch.
It works best on an iPhone or iPad, because with 3G speeds (and with the new iPad, 4G speeds), it allows you to keep within your data tariff parameters and without going over. It differentiates Wi-Fi data and 3G/4G data so you know how much you are spending while you're at home or roaming abroad.
Compatible with: iOS 5, 5.0.1, 5.1.
EZDecline allows you to reject calls from your home or lock screen, without having to fumble around looking for the decline button. You can always sleep your device instead of "sliding to accept" the call, but not many people know that. It's as if Apple wants you to take calls and not avoid them.
This application simply adds a "Decline" or "Answer" set of buttons, allowing you to easily decline the call should you wish, hence the name of the Cydia tweak.
Compatible with: iOS 5+ (including 5.1.)