If I buy an iPhone from ebay will I be able to use it?

Assuming I don't buy it and activate it, will I be able to use it (except from texting, calling, etc) on Wi-Fi? Or will I be locked out until I decide to pay $30 a month to get it activated?
This one for example:
http://www.ebay.com/...1352523047

The best option is to get it is from amazon they a more trustworthy and they have effective and brand new iphones ebay is not 100% trusted. Check the link below.

http://www.amazon.com/...gp/search/

If you buy a phone from ebay, there's a 98 percent chance that you will be able to use it on Wi-Fi. But if not you will have no other choice but to purchase the 30$ activation fee to get it activated. But i believe that you will be able to use the phone off of Wi-Fi.

Of course you can use it

If you buy it on eBay, you will have to call to get it activated and use the serial code as they can't do it in the store.

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