How to use a bad esn verizon iphone 4 as an ipod touch?

I bought a bad esn verizon iphone 4 to use it as an ipod touch. The iphone doesn't have any locks on it. The seller said that I just have to put the airplane mode on and turn on my Wi-Fi. But is there another way besides having to put the airplane mode on?

If you put it in airplane mode there will be no Wi-Fi because airplane mode means no radio waves. There's a slider switch in the general sttings to turn off cellular. Then the Wi-Fi is still allowed to work to use for facebook, email and stuff.

Why would you not put it on Airplane mode? You've nothing to do with it like calling or texting, just use it as iPod.