Improve the privacy of your contacts by defining which of them should be shared with other apps and which should remain private (secret). While you may be willing to share most of your phone's contacts with apps like WhatsApp or Instagram, you probably don't want to let them know about some others like your doctor, therapist, etc. First, you don't communicate with them over WhatsApp anyway. And second, this is a real privacy-issue because the mere fact that you have that number stored means t