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Instead of regular keypad tones, MIUI lets you have piano keys tones in their default Phone app. : r/Android
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How to Turn Off the Android Dialpad Sounds: 6 Steps
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SOLVED:Touch-Tone Telephones When a key is pressed on a touch-tone telephone, the keypad generates two pure tones, which combine to produce a sound that uniquely identifies the key. The figure shows the
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The DTMF Tones Generated from a Phone Keypad. | Download Scientific Diagram
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