OpenContacts | F-Droid - Free and Open Source Android App Repository
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fairly easy
F-Droid is an installable catalogue of FOSS (Free and Open Source Software) applications for the Android platform. The client makes it easy to browse, install, and keep track of updates on your device.
OpenContacts Hide contacts away from apps stealing your contacts information

Even though we are not having any problem sharing our mobile number with all third parties, people in our phone book might have. We should not be sharing their contact…
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