To use this Application, you need a subscription for the proprietary wivewa.de server component This is the Android client for WiVeWa. It is mainly a Browser that opens WiVeWa, but there is more: - the App uses a private key that is generated and stored in your hardware for the authentication - the App downloads the addressbook and provides it as "Wontakte" - the App can show caller details (name + last ticket) when using Welefon or another compatible App - the App can upload incoming and outgoing call details to the WiVeWa phone system ("Korrespondenzliste" extension)