Artificial sun is an alarm clock for Android smartphones and tablets that wakes you up by using blue light. In order to prevent alarm from ringing while you are in a phone call we require a permission to android.permission.READ_PHONE_STATE. It is very unfortunate that we have to use that even though we only need to know whether phone call is on or not. Regardless, there is no way for the app to access the internet, so you can be sure no data leaves your device. We are not interested in gathering any private or personal information. Enjoy using the app!