When you sync your address book, we add your device contacts to Skype where they are periodically synced and securely stored. You'll see who is on Skype and your contacts will also find you more easily in search. You can opt out of search and suggestions in your mobile or desktop privacy settings at any time. We also sync your contacts from SMS Connect conversations. The option to sync your address book is not available in Skype on Windows Desktop, however, it is available in Skype for Windows 10 (version 14).

1. From Chats, select your profile picture.
2. Select Settings .
3. Select Contacts .
4. Toggle Sync your contacts on. 

Note: If you add any new contacts to your Mac address book, you will need to manually refresh your contacts in Skype Settings.

Turn Sync your contacts off

You can easily turn Sync your contacts off in settings. Keep in mind when you stop sharing your device contacts, those who aren't on Skype will be removed.

1. From the Chats tab, select your profile picture.
2. Select Settings .
3. Select Contacts . 
4. Toggle Sync your contacts off.

Android 4.0.4 - 5.1

1. From the Chats screen, then tap the menu   button.
2. Tap Settings .
3. Scroll down to contacts, and toggle Sync phone contacts off.