Telephoning 1: phones and numbers

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Across
  1. 3. a mobile phone with advanced features like internet and apps
  2. 4. message a written message sent from one phone to another
  3. 6. an internal phone line within a company or organization
  4. 7. a phone connection to a telephone network
  5. 10. a public phone operated by coin or card
  6. 12. technology that allows phone calls over the internet
  7. 14. code the numeric prefix for international calls to a specific country
  8. 17. a traditional wired telephone connection
  9. 18. real-time video meetings between participants in different locations
  10. 20. a voice message to record a spoken message when someone cannot answer a call
  11. 21. and microphone equipment used for video and audio communication online
  12. 23. another term for a mobile phone (especially US English)
  13. 24. code the number used to designate a specific geographic phone region
  14. 26. line a phone number used to reserve tickets or services
  15. 28. the unique set of digits assigned to a telephone line
Down
  1. 1. line a phone number for making bookings at hotels, restaurants, etc.
  2. 2. an electronic system for storing voice messages
  3. 5. a device used for voice communication over distances
  4. 8. a direct and immediate access phone number for urgent issues
  5. 9. an app that supports voice and video calls over the internet
  6. 11. phone a portable telephone that uses a cellular network
  7. 13. card a prepaid card used to make phone calls from payphones or abroad
  8. 15. line a service that gives recorded or live information via phone
  9. 16. third-generation mobile network technology
  10. 19. phone a phone with no cord, allowing free movement during calls
  11. 22. a phone service providing assistance or information
  12. 25. faster fourth-generation mobile network technology
  13. 27. to send a short written message via phone