IPhone with CLEAN ESN as an iPod?

Hi, I have an opportunity to buy an iPhone 4S claimed to have a CLEAN ESN. It's on a different network than I'm, but I mainly want to use it as an iPod. Can I just use it as an iPod with a clean ESN, because I know you can with a bad one, just need a clarification.

Yes. Any iphone can be used as a ipod clean or not.

You can use any iPhone as an iPod. I will work with Wi-Fi. I could possibly "phone home" over Wi-Fi if it was stolen.

Yes you can use any iPhones as an iPod no matter what, however you won't be able to call or text people since you won't have service but you can use it with Wi-Fi and it'll be great. I use my iPhone as an iPod and I'm never off it ha.