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Hot on the heels of the impressive next generation iPhone renderings revealed last week, designer Martin uit Utrecht has given us even more eye candy. This time the renderings of the iPhone 5 are done in both white and black, complete with fingerprints on the metal back.

These designs are based on leaked parts and diagrams showing a slightly longer device with a thinner profile. The taller iPhone 5 will accomodate an extra row of home screen icons thanks to a larger film-aspect ratio display. Apps not optimized for the larger screen are expected to run in letterbox format.

The new iOS and Android app Carat promises users better battery life by delivering tips on how to conserve energy. According to TechCrunch, the app was designed by a " top-notch" team of "M.S. and Ph.D scientists from the UC Berkeley electrical engineering and computer science department’s Algorithms, Machines, and People Laboratory (AMP Lab)."

The free app uses gathered information from your device to decide what apps are hogging your iPhone's battery power. To do this the app has to take "measurements" from your device. This means you will need to allow it access for it to work. It also takes a few days to collect data before it can start sending you battery saving tips. So don't expect instant results.

What's great about Twitter and several other apps on the iPhone is that you can simply pull down to refresh information. Jailbreakers may already know this is the preferred way to refresh with IntelliScreenX, for example. Apple has seen the light and will be adding this functionality to the Mail app in iOS 6.

If your device is already jailbroken with Absinthe, you can add pull to refresh to your Mail app right now for free. The name of the tweak is Pull To Refresh for Mail and it comes to us from developer xh and the BigBoss repo on Cydia.

If you can't login to YouTube on the iPhone, there are simple steps you can take to allow the native YouTube app on your device to connect. The problem arises when your linked Google Account does not have an application-specific password set up for your iPhone YouTube app.

After repeatedly trying to login to your YouTube account with the correct username and password, the iPhone prompts you to login from Safari. Even after following through this process, the YouTube app refuses to acknowledge your credentials are correct. The iPhone error states wrong username or password.

It may seem like a simple thing, but one great feature that Cydia has over the App Store is a queue. Several packages can be browsed and selected, then the whole list is installed at once. While this speeds up the process of installing apps, the App Store exits every time you download an individual app.

All of this is set to change in iOS 6. The revamped App Store will stay open and download apps in the background, so you can continue browsing. This avoids the whole process of having to reopen the App Store every time you install or update an app. Luckily if you have jailbroken your iPhone, you can add this functionality to the App Store right now.