How does touch tone work?

Related questions

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2. How do I find the main phone line in my house?
3. Why does my cordless phone have no dial tone?
4. What are DTMF settings?
5. What were rotary phones made of?
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7. What does DTMF mean in slang?
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Tags

1. #switch
2. #phone
3. #simply
4. #combination
5. #hertz
6. #completion
7. #senses
8. #sounds
9. #plays
10. #sound
11. #working