How to buy iPhone without a plan?

I wanna buy a used iPhone 4 off of eBay but I don't want a plan or a carrier on it so how do you do that?

You make sure the phone is unlocked. But be very careful and buying you this because odds are they say that it is but it isn't. I've seen plenty of people here who buy used phone thinking it's unlocked and it ends up being not only locked but actually has outstanding balances of the payoff.

Most of the iPhones on eBay are being sold without any plan. The phones may be locked to a particular carrier but they don't come with service plans.

Buy unlocked iphone from any shoping store or website

If you don't want to use it with a carrier then why not just get an ipod touch?