Tone dialing and plus dialing are known to be two ways that people have used before in order to connect to the central telephone relay. Tone dialing will make sure that there are specific tones that can be used in order to place the number.
Pulse dialing will require different signal pulses. Tone dialing will already come with the keypad that people can press in order to get what they want. Pulse dialing will require the use of rotary dials. Most people prefer tone dialing because this will not require you to spend a long time as compared to pulse dialing. It is not a surprise that pulse dialing is already obsolete and people still use tone dialing right now.
When you dial a number on a standard phone, you may hear the sound of the button being pushed. This has to do with either tone dialing or pulse dialing. Today, we use tone dialing, which is where each number has a specific tone when pushed. If you have used a standard phone instead of a mobile phone, you may be able to recognize the number based on the tone that sounds.
The pulse dialing has several signals that can be heard for each number dialed. If you use a rotary phone, you will listen to the pulse dialing. On a touch-tone phone, you will listen to the tone dialing. If you use pulse dialing, it will take a while, whereas tone dialing is fast.