This is the reason Facebook has been pushing so hard to get it’s apps (Instagram, WhatsApp, Facebook Messenger) on your phone. They are all there to collect your data.

Sean Gallager, ArsTechnica:

This past week, a New Zealand man was looking through the data Facebook had collected from him in an archive he had pulled down from the social networking site. While scanning the information Facebook had stored about his contacts, Dylan McKay discovered something distressing: Facebook also had about two years’ worth of phone call metadata from his Android phone, including names, phone numbers, and the length of each call made or received.

More:

Facebook has been collecting call history and SMS data from Android devices – The Verge

iPhone protected you from Facebook call scraping. Android, not so much – iMore