Should i change my iphone 4 for iphone 4s?

Is there a good reason to do this?

IPhone 4s is a little faster but you do not need to change iPhone 4.

If upgrading from 4 then might as well go to 5, best buy had just run a special where you could upgrade for under $20 by trading in your 4 (and extending 2 years on the contract), not sure if they are still doing that.

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