Better to sell iPhone on internet or in a store?

I hate my iPhone (and it isn't supported by Page Plus). Where can I get the most for it? I would like to get enough to afford a smart phone that is supported by Page Plus. Any advice on that front would be appreciated as well… (Best website to find one, preferably with a small warranty under $150)

Hi, check these guys out: http://ibuybroken.com/sell_recycle_iphone
They paid for the shipping and sent my money same day it got there. They buy all kinds of phones in any condition.

Selling in a store will always get you the lowest price.
There's a new company who is good -they've been going in US and UK etc for ages and just opened their website in Australia - http://www.topdollarmobile.com.au/
They supply a free parcel to you and then send you cash straight away once you freepost it in. They also recycle all phones safely and contribute to charity.