
FRITZ! Fon C6

FRITZ! Fon C6
Good day. We bought the FritzFon C6 last week and were able to connect it immediately to our Fritzbox Internet fibre. But- we can't add phone numbers or set the display. Sunrise says the FritzFon C6 is not universal and therefore not compatible. Is this true? If so, we have to send it back.