Do cell phones use VoIP?

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  1. #voice
  2. #customers
  3. #offer
  4. #other
  5. #packets
  6. #clients
  7. #difference
  8. #company
  9. #advanced
  10. #service
  11. #phone
  12. #protocol
  13. #features
  14. #knowing
  15. #acronym
  16. #officially
  17. #stands
  18. #systems
  19. #without
  20. #communications
  21. #internet
  22. #providers