What will happen if you reply to overseas spam text messages?

No impact.

Don’t worry about information leakage. When he sends you a message, your mobile phone number has already been leaked. It’s better not to reply to text messages like this in the future, because you don’t know what means he will use to trick you. Get your other information.

Don’t let marketers with no bottom line know that this number is used by a real person, otherwise it is very likely that there will be more marketing text messages in the future.