What is the purpose of a magnetometer in a mobile device?

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Tags

1. #phone
2. #rotate
3. #based
4. #result
5. #magnetic
6. #phones
7. #sensor
8. #called
9. #field
10. #physical
11. #north
12. #depending
13. #compass
14. #which
15. #usually
16. #always
17. #earth
18. #magnetometer
19. #provides
20. #mobile
21. #knows
22. #digital
23. #orientation
24. #simple
25. #relation