When someone asks me for another person's phone number, I first look at who the other person is. If everyone is just a colleague, the other party needs to find another colleague because of work. If I have his phone number, I will usually give it to him. But if he asks for other personal information, I'm sorry I have nothing to say. This is someone else's privacy.
If a stranger asks me for another person's phone number, I won't give it. If I ask for other personal information, it is even more impossible to tell each other casually, which involves the privacy of my friends. If you hurt a friend, you will really be sorry for your friend.