What is GSM explain?

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Tags

1. #sends
2. #world
3. #digitizes
4. #phone
5. #other
6. #europe
7. #channel
8. #system
9. #network
10. #streams
11. #compresses
12. #parts
13. #global
14. #widely
15. #digital
16. #mobile
17. #communication
18. #users