One of the perceived downsides of the smartphone industry is the monopolization of devices through carrier locking. At point of sale and when you sign up to a contract with a carrier, it's understandable, but thereafter, getting a handset unlocked can be a trying, if not impossible process. If you want to check whether your device is unlocked for use on any network, a nifty online service completely has your back, and not only is the website incredibly easy to use, but if you're on Android, there's also an app available to download over at the Google Play Store. More details after the break.