What is the DTMF tone on a cell phone?

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Tags

1. #signals
2. #signal
3. #dialing
4. #frequency
5. #carrier
6. #press
7. #generate
8. #replaced
9. #touch
10. #generally
11. #pulse
12. #tones
13. #produce
14. #phone
15. #keypad
16. #multi
17. #pressing