That's a big deal because a phone number is required to use WhatsApp, as its more than one billion users are already aware. Thankfully, current WhatsApp users who may be concerned over the prospect of their phone number being shared with Facebook have a way to opt out (via Venturebeat). When presented with the new, updated terms in the app, simply tap "Read" instead of agreeing right away. From there, you can scroll down to the bottom of the screen and uncheck the box giving your permission to share information with Facebook.
If you happen to accidentally agree to the new terms before reading, all is not lost: you have 30 days after accepting to change your mind. All you have to do is head to Settings > Account > Share my account info and uncheck the box.
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