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One of the strengths of the iPhone display is its brightness. This is great during the day, when you want to be able to see the screen as easily as possible. Night time is a different story. We've all seen smartphone users' faces illuminated in a bright, blue glow at night. Not only does it look strange, but this light can actually interfere with the body falling asleep.

The developers of f.lux have a different idea, iPhone display lighting colors that actually match the time of day. They have released similar software for desktop computers, which automatically adjusts the color of your display. F.lux is smart enough to know when sunset occurs based on your location, so your iPhone adjusts without intervention.

Facebook has been working hard on its iOS app, with several updates launching recently. The latest free update hit the App Store on February 22. Most visible are new sharing buttons, which are simpler to use and provide an easier way to like, share and comment.

Free in-app calling is now officially a part of the Facebook app for iOS, making it possible to call your friends in the US and Canada without using voice plan minutes. The feature will of course use up some of your data plan as these calls are placed over the Internet.

The Flickr iOS app received some new features thanks to the latest update released on February 21. Besides faster image uploads, users will notice a new user tagging feature that works by typing @screename. Lightbox thumbnails are also now a higher resolution than they were before.

Flickr makes it possible to view and participate in everything the photo sharing site has to offer. The mobile app has received many great reviews for its design and functionality. Flickr is a Yahoo! product and can be downloaded on the App Store free of charge.

Let's face it, there are some features of Android that iOS could benefit from having. Seriously, why doesn't Apple show photos in the stock Contacts list? If this is a feature that interests you, now that the evasi0n jailbreak is available you can easily add this to your iPhone. Jay Freeman, the creator of the jailbreak app store Cydia, developed Cyntact years ago and has kept it updated.

Once you install Cyntact, all of the photos associated with your contacts appear magically in the Contacts list. It's that simple. The photos will also appear in your Favorites. Sure, this tweak may not be essential, but it's a nice touch when you've spent the time to actually use photos on the Info pages of your contacts.

Looking for a cool way to take advantage of your jailbroken iPhone? Although the tweak Barrel is completely cosmetic, it's an eye-catching customization to the stock home screen. Normally when you page through home screens full of icons, nothing interesting happens.

Barrel changes all this by offering a growing list of Icon Pages Styles, which are basically animations that take place to your home screen icons when swiping left or right. There are 21 different modes to choose from, not including Normal which turns off effects.