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The rotary phone was created in 1891 and was one of the first phones that was widely available for almost everyone to use. It is best known for having a dial with holes in it and numbers that circle around the dial and are by each hole. The phone part that you talk into sits on top of the box with the dial and is connected to the box with a wire. It is an analog phone not digital. This phone uses analog waves that are viewed as curving waves and typically use land lines.
Cell phones are the common phones that we use today. They are digital unlike rotary phones which are analog. They are hand held devices and are wireless so they can be taken anywhere. The first portable cell phone was made in 1973. Today they have become a common device that most people use almost everyday of their lives. Rotary phones used to be the most popular but now cell phones are the most popular phones used. This phone uses digital signals which are viewed as square waves.
To use a rotary phone you need to first pick up the receiver. After doing this the line will be activated. Since the line is activated you can now dial the number. To dial a number you put your finger in the hole that corresponds with the number and spin the dial to the stopper and let go. You then do that multiple times for the rest of the numbers.The purpose of a rotary phone was to simply call people. Even though the purpose seems pretty simple, how it works is more complicated. It works using pulses. When you turn the dial to the stopping point and let go of the dial it moves back to its original position. It will then send out pulses based on the number that you used. After using all of the numbers in the phone number it will call that number from sending the pulses. Since it is analog, the original pulses it sends are high quality.
Cell phones are used by pressing numbers that show up on your screen. All you have to do is type in the number that you want to call and then it will call that number. You can also add contacts where it saves the number and then all you have to do is press one button to call that contact. Its main use is like the rotary phone. It is mainly used to talk to others far away. It seems simple but the way it is able to do this is not as simple. When you call someone with a cell phone it sends out waves from your phone to a tower. This cell tower sends the waves to a cell tower near the person you are calling. The waves are then sent to the other persons phone so you can talk to them. Your voice is converted into digital binary and then converted back when it reaches the other persons phone. The digital signal from this phone transmits farther than the analog one can but does not have a higher sound quality.
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