How much shall I sell my iphone 4 for?

Got a year old iPhone 4 the contract has just run out so i'm getting a new phone. I get to keep my old one. How much do I sell it for it works and everything.

and will it be locked I don't understand it

I've recently seen some go for 80 bucks but you could get 100ish. If you have the original headphones and charger then you'll get around 100 for it for sure.

I would just trade it in on upgrade. Thats easy and doesn't waste any of your time.

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