Most heavy mobile phone users are humstrung because of the large amounts of bandwidth they use. There are a variety of ways to save on your smartphone bills. One method is to sign up and download apps that pay you to unlock your smartphone. This is something that should not warrant a payment under normal circumstances since it is obligatory. Some of these apps are Slidejoy, Screenplay and Fronto and are fit for Android and IOS platforms. You rate on airtime and bandwidth simply by unlocking your phone.