What are DTMF tones on a cell phone?

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Tags

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