Also verify your contacts when possible. A friend showed me how you can verify each contact with a QR code.
Recommended for potential MITM attacks.
It’s good when you have kind and smart friends.
www.howtogeek.com/709074/how-t...
Use Signal. You don’t have to use your own phone number now.
To respect their privacy do not give it access to your contacts but adding them manually works just fine.