How should buy a new iPhone everytime?

The question is: does it worths to sell your Iphone and buy the new one?
For example: i bought my Iphone 5 for 300$ in apple store locked to att; i unlocked it for 25$. I'm thinking about selling it for 800$ in gamestop for example and then i will have to use another phone during sometime but does it worths to get the 5s when is released?

How did you get iphone5 for $300?

Totally worth it my friend. Plus you can't beat that $500 profit margin. I'm a tech support guy for Verizon Wireless and know for a fact that the iPhone 5s is gonna be so cool!

My theory is use a new phone 2-3 years, that way you can get a new phone on contract so its cheaper, and your current version is still worth a fair amount to sell it.

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