Developer's DescriptionBy AVM GmbHMake phone calls with the FRITZ!Box at home, via fixed line and Internet.FRITZ!App Fon connects to your FRITZ!Box via WLAN so that you can use your mobile for calls over the fixed line or the Internet. Models that support FRITZ!App Fon: 7390, 7320, 7270, 7240, 7170, 7112, 6360, 3270Setup instructions appear upon start. Internal group call with "**9", answering machine with "**600", more in the FRITZ!Box.