One of ZAGG's most popular products for the iPhone and iPad is on sale while supplies last. The legendary invisibleSHIELD device protector is now offered buy one get one free, with free shipping to boot. The invisibleSHIELD is designed to fit each device perfectly, protecting the screen, back or entire body of your smartphone or tablet.

The material that comprises the invisibleSHIELD is strong, transparent and unlike any other screen protector on the market. For details on the installation process see this overview of installing the invisibleSHIELD on the iPhone 5. With ZAGG offering this product buy one get one free, you can protect more than one mobile device for half price.

Ironhide Game Studio has released the first teaser trailer for Kingdom Rush: Frontiers. The game is a sequel the popular tower defense game Kingdom Rush. The trailer doesn't reveal much, but it does show all the original turrets (Mage, Archers, Barracks, and Artillery) from the first game. Ironhide said the "bigger, meaner and better" sequel will be released this fall.

In the original game players use a combination of towers, magic and upgrades to fend off armies of goblins, trolls and other monsters. The game is set set in Medieval times, and is considered one of the best TD games released for iOS and Android devices. You can download the original iPhone version for $0.99, or the HD iPad version for $2.99.

Apple has released iOS 6.1.3 which fixes the lock screen security bug, and improves the Maps app for users in Japan. It is unknown at this time if the update patches the evasi0n jailbreak. This means users with jailbroken devices should avoid the update until we learn more. All other iOS users can navigate to Settings > General > Software Update, or connect their devices to iTunes to upgrade their devices.

The evad3rs' Twitter feed has been quiet since the release, and the official evasi0n website has not been updated to reflect it supports the new firmware.

UPDATE: Evad3rs member MuscleNerd issued this warning to jailbreakers via Twitter: "IOS 6.1.3 is out. Jailbreakers stay away! There's no coming back to 6.1.2 JB even if you saved blobs (except iPhone4 and ipt4g."

Pandora fans may have noticed the only way to give a thumbs up or thumbs down to a particular track is to have the app open. Of course, with iOS you can skip tracks using the multitasking switcher or by pulling up music controls on the lock screen. But this won’t register your approval or disapproval of the track, steering the future of your radio station.

Now with the jailbreak tweak ThumbsUp installed, you can add thumb buttons to the lock screen music controls. This provides a simple and fast way to record your preferences with Pandora, without unlocking your device and navigating to the iOS app.

The wait is over for fans of tactile keyboards on the iPhone 5. The MiniKey is NUU's answer to the slide-out keyboard case, providing Bluetooth connectivity and replacing the on-screen virtual keyboard. The iPhone 5 version of the MiniKey is slimmer than previous models and as always, it protects your device like a normal case.

As anyone who has used a Bluetooth keyboard knows, eliminating the need for the on-screen keys provides extra space for whatever app you're currently using. The full display can be devoted to content, since the keyboard is off-screen. NUU has designed the keys on the MiniKey with a tilted face, to match the ergonomics of typing with both thumbs.