A number sent me a text message (mobile phone). Why don't you call back with an empty number?

The other party set up call forwarding to transfer the incoming call to an empty number, so the number you dialed for him is empty. But he can receive the message you sent him. A buddy in our dormitory often does this. He transferred some numbers to his original number (that number is not available now), and we couldn't get through. This can prevent others from being harassed, and you can also set it up in the call forwarding in the settings.