Reselling a US Cellular Programed Phone

Hello,
I recently went to US Cellular and signed up for a new 2 year contract and bought a new phone (I've been very happy with the company). In the past I've always recycled my old cell phone when I signed a new contract, and was planning on recycling my old Red Razr phone. The salesman said since my phone was in good shape, etc why not try to resell it?

I thought that was a good idea, however I'm not sure how to prep the phone for resale, and looking for suggestions.

Beyond the obvious deleting contacts, texts, photos, etc what else should I do?

It's been my understanding US Cellular doesn't have removable SIM cards, and when I power the phone on it still shows my number, etc (though it won't allow me to place any calls), and that concerns me.

I am new to this and not very knowledgeable, so any advice on how to prep the phone would be appreciated, thanks!

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never mind. Called US Cellular, they told me to bring it into a shop and they will wipe the phone. Good info in case anybody else is interested in doing the same, thanks.

Wouldnt you wanna keep a spare phone around just in case?