How to buy an iPhone 4S on eBay?

I don't get the bidding part!

You just bid on the item with how much you are willing to pay for it. At the end of the auction, if you are the winning bidder you will get the item. Some items will have a buy it now option and sometimes they can be more expensive but not always. Make sure you look over the descriptions and costs thoroughly before bidding. An iPhone may be at a cheap price but also may have problems.

First you create an account then you search for an iphone. Each item has a set date where the auction is over, you are going to want to be the person that has the last bid near the end of the auction or else you will not get that discounted item PS. They charge you a dollar or so every month off your eBay account