You need to look at the sellers feedback and see what other buyers are saying about the seller. I think the sellers postive feedback needs to be above 90%.
Posted from my CrackBerry at wapforums.crackberry.com
Personally I would not buy a cell phone used. Or from Ebay. There is no way to warranty this phone if it were to break in 6months. Say the speaker stopped working or the bottom half of the screen stopped working.
I also thought about getting an I from ebay but then asked myself what if.
The Iphone is alot cheaper than the newest BB's. I'm not putting the blackberrys down, I am just saying from having been on both sides of the water
I feel the Iphone offers most of us users more and better.
It's safer to go into a store and buy it for that price. Then unlock it yourself. The process is easy. If you have at&t, you don't even need it unlocked.