If there is software that cannot send the contact information, the other party may have set up information protection, so he cannot receive unfamiliar messages. You should call him first and let him know so that you can become friends before you can send contact information to each other. .

In some dating software, when the other party has set up personal information protection, they cannot receive messages from strangers. If you want to send a message to the other party, you have to become a friend first.