So I found a phone / pda thing I think will be perfect for me (thanks gerbs). But apparently I am not "eligable" for a new phone for my Cingular account until April 2007, unless I want to buy it for $450, which I don't.

So I notice they have this particular phone on eBay. I notice some of the descriptions say "unlocked". So is there anything I need to be aware of when purchasing or bidding on a phone on eBay and what does "unlocked" mean?