Joke Collection Website - Blessing messages - Why didn't the sender's address appear in the received text message?

Why didn't the sender's address appear in the received text message?

There is a mobile phone service now. The sender adds the number provided by the service before the mobile phone number of the short message receiver. When the receiver receives the short message, the other party's number will not be displayed. I played this at my deskmate, but I felt bored ~!

Yes, nothing is displayed ~!