Verifying my phone number in Skype Preview for Windows 10
In Skype Preview for Windows 10, we ask you to verify your phone number if you want to automatically add people from your address book who are also on Skype.
Skype will use this information to verify your contact details and allow others to find you on Skype. By verifying your contact details, we can help ensure that we're adding the right people when automatically adding friends.
To change the setting later, open Skype Preview, select Settings, then under Contacts select Don't use my address book.