The app is totally secure for downloading. DH Corp. is the creator of Dzwonki that can be found in the Educational category. Users rated the tool 3.3 on Google Play.
This application was downloaded and set up by over 1K users and the latest stable release was on Oct 20, 2014. Download the installer of Dzwonki 2.1 that is provided for free and have a look at users' reviews on Droid Informer. The app is developed for Android 2.2 and above.