Dual Tone Multi Frequency is sent from mobile to mobile during a call using keypad different keys have different tones and can be decoded using a 3.5mm audio jack at the receiver end.
Dual Tone Multi Frequency
Dual Tone Multi Frequency is sent from mobile to mobile during a call using keypad different keys have different tones and can be decoded using a 3.5mm audio jack at the receiver end.
Dual Tone Multi Frequency
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