You can add, change or delete your contacts directly using the handset in Windows Outlook (via plugin) or in the macOS address book.The central phone book can be synchronised with a local Windows Outlook contact folder (via plug-in) or with the macOS address book.
To the Outlook plugin instructions
The main Centro Business 2.0 telephone directory is being gradually rolled out to users. You will receive a postal notification as soon as you can use the main telephone directory with your Centro Business 2.0. You will also be notified in My Swisscom once the main telephone directory is available for you to use.