(Telecompaper) O2 Germany has launched a new telephony service, the O2 Message+Call app, enabling customers to make calls via WLAN. Other features such as video telephony, chat and data transfer are possible as well. The app is currently available in a beta version, and will be continuously developed and optimised based on customer response. In a first step, the app is available for O2 contract subscribers without a multicard who use an Android smartphone (from version 4.0). Prepaid customers, multicard users as well as E-Plus and Base customers will get access to the app at a later stage.