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.

If you are new to iOS jailbreaking and want to know details about exactly how apps and tweaks are paid for, look no further. While the App Store is convenient and linked to a credit card through iTunes, you'll find that the jailbreak app store Cydia is just as convenient. Purchasing and installing third-party tweaks and apps to customize your iPhone, iPad or iPod touch has never been easier.

Once your iOS device is jailbroken with evasi0n you can begin to browse Cydia for interesting tweaks. When you're ready to install a package that requires payment, you'll see a Purchase button in the upper right hand corner. In the example below, the app CleverPin costs $1.99.

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.