Windows Phone 8.1 - Only display contacts with a phone number
Once you have synced all your social accounts (Facebook) and messaging services (Skype) with your Windows Phone 8.1, you will notice that the contact list has become a real mess. If you want to have only the people with a phone number displayed in the contact lists, follow the below procedure:
Go to the App List > Settings.
Swipe left to access the applications menu.
Tap on people .
Tap on filter contacts
Toggle the "Hide contacts without phone numbers" switch to ON.