Why do iPhones retain value?

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Tags

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2. #highest
3. #smartphone
4. #better
5. #their
6. #other
7. #which
8. #driven
9. #smartphones
10. #dealer
11. #leading
12. #iphones
13. #significant
14. #removed
15. #value
16. #minute
17. #prices
18. #devices
19. #resale
20. #study