DTMF Decoder Ranking & Summary
DTMF Decoder description
Turns your iPhone into a simple DTMF decoder. Simply hold the iPhones microphone near to a clear source of DTMF tones (telephone "Touch Tones") and it will display the numbers being dialled.
A row of LEDs indicate which frequencies are present in the signal - each LED corresponds to a single frequency.
See it in action here:
Requirement:Compatible with iPhone and iPod touch (2nd generation) Requires iPhone OS 2.2.1 or later
DTMF Decoder Screenshot
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