1. People in a conversation with you (including a group conversation you are added to, which I believe you can limit to require your consent) can see your phone number
2. People who already have your number in their contacts can see that your number is registered with WhatsApp
1. People in a conversation with you (including a group conversation you are added to, which I believe you can limit to require your consent) can see your phone number
2. People who already have your number in their contacts can see that your number is registered with WhatsApp