What does DTMF mean in slang?

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Tags

1. #phone
2. #generate
3. #elsewhere
4. #formerly
5. #frequency
6. #ordinary
7. #multi
8. #touch
9. #trademark
10. #telephone
11. #states
12. #perhaps
13. #press
14. #signal
15. #known
16. #registered
17. #company
18. #touchtone
19. #united