About TouchTone (DTMF) for WP7
An application to generate Dual-tone multi-frequency (DTMF) signaling directly from the phone. This can be used to dial other touch tone phones by holding the generating phone close to the target phone after pressing play. Ensure the volume is set to a sufficient level.
- Generate DTMF signalling using the phones speaker.
- Dial another telephone by holding the WP7 up to the receiver/mic of the target phone