What is the job of special service?

Special service is a value-added service in addition to calls. In addition, there are 110, 1600, 1001, etc., which are all special service phones. Since the number of these numbers is generally less than the number of normal phone numbers (7 or 8 digits), they are also called short numbers. Relatively speaking, the principle is similar to that of a voice-activated phone, and it is specially designed for people with limited mobility due to damage to their motor nerves to make calls. It uses oral blowing instead of finger dialing. The dial is a special device that displays 10 numbers from "0" to "9". The user only needs to blow air into the microphone on the phone to "move" easily. "Use the numbers above to compile and send the phone number you need.