On Windows 10 Mobile, we check your phone if you want to automatically add people from your address book who are also on Skype. You'll be asked to verify your mobile number in order to automatically add friends to Skype.
To change the setting later, open the Skype Video app, select More > Settings, and then select the setting you want under Automatically add friends.
For more info, see How is my phone number used?
Article ID: 10625 - Last Review: 31 Aug 2016 - Revision: 12