Requires Xposed Framework and Xposed Call Blocker. This is only a key! A trial version is available here, please confirm it works before buying this: Xposed Call Blocker is a call blocker implemented on the lowest common userspace level. This means that it's better than any other app at blocking calls without diverting them through the network.
Mohammad Abu-Garbeyyeh is the developer of this application which is related to the Tools category. The latest update was on Apr 8, 2014 and the app was downloaded and installed by over 1K users. The overall score for Xposed Call Blocker Unlock Key is 3.9 on Google Play.
This application is often downloaded by Samsung and LG users. Download the latest setup package of Xposed Call Blocker Unlock Key 1.0 for free and have a look at users' reviews on Droid Informer. The app is designed for Android 4.0.3 and above. This download is totally secure.