In the past, how did the BP machine send messages without entering the keyboard?

That era was the era of public telephones, and there were no mobile phones. Even if there is, it is also a gadget of the rich, called a mobile phone.

Then the problem is coming. What should Zhang San do if he wants to contact Li Si?

The BB machine was born,

Digital machines cost hundreds of thousands of yuan and can only display numbers.

The Chinese machine costs about 2000 yuan and can display numbers and words.

The usage is very simple, for example, Zhang San wants to contact Li Si,

I'm going to find a public phone that Wednesday. Call the service center of BB (126/ 127) and tell the operator to leave a message for the designated BB host or leave a call back number (public telephone number) to call back.

China BB machine

This is a BB machine from China. You can leave a message directly to the other party without waiting for the other party to call back.