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How frequency is converted to numeric number,for example i clicked on '1' of my keypad and it is shown in screen of my mobile or computer? I seem, this happens not only for number but also for others keys of keyboard.What is the fact behind it?

Engineering
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Programs and circuits.
You might be referring to Dual-tone Multifrequency signalling used in telephony... hope this helps... :) http://www.engineersgarage.com/tutorials/dtmf-dual-tone-multiple-frequency
thanks for your help @Orion and @Johnbc is DTMF is used in modern technology like android,iphone and others ?

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Other answers:

yes it is... apps in android, iphone and others depending on your skills in programming can do it....

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