Vodafone One App APP
One App is primarily developed to support you to manage telephony settings for your primary (personal) business number. That is the fixed number for One Vast, One Combi and One Flex users; for One Mobiel that is the mobile number. You can also use One App to find your internal contacts and check their reachability before calling.
Beside this, One App can be used to improve your call control through support of features such as call transfer or 3-way calls.