Is it illegal to prohibit sending contact numbers and other contact information on chat software?

It is not illegal to send contact phone numbers and other contact information on chat software. It is illegal to send numbers in private messages, and there is no rule that private messages are not allowed to send phone numbers. Because this is also the security guarantee given by the platform to users, if someone wants your contact information, be vigilant and avoid telecom fraud.

The reason why the chat software can't send out the contact information

Because of security and privacy, direct contact is not allowed, and many dating platforms cannot send mobile phone numbers.

The reason for this restriction is that the English platform will think that there may be property fraud in sending mobile phone numbers to each other. In order to avoid taking responsibility, the platform restricts users from sending mobile phone numbers. If you really want to send a mobile phone number, you can choose the homonym of the mobile phone number to represent the Arabic numerals reflected below, or you can choose to use Chinese capital numerals to represent it.

When someone gives you contact information, you should also pay attention to the authenticity of the other party's information, and don't just click on the link sent by strangers. It is very likely that this is a telecom fraud.