Craigslist or eBay, but i don't know how well that would work out for you with a different service...but I've never tried i have at&t
You can find out more information on the iPhone 4 from friends, by asking someone at the store, or by looking online. I have unlocked the iPhone 4 by just asking friends and looking it up online.
Yes, wether the iPhone is legally unlocked or jailbroken-unlocked.
You can visit apple.com or visit a local apple store for unlocked iPhone.
Unless its an iPhone then it would be no.
You can check to see if your iPhone is unlocked by inserting a SIM from a different service provider and try to make a call, if its successful. Your iPhone is unlocked.
eBay or Craigslist
Yes, you can now buy the iPhone 4S unlocked direct from the Apple website
yes. once an iphone is universally unlocked it will work.
There are several providers of unlocking services for iPhones - both on location in Orlando, but if you don't have an unlocked iPhone yet, you could check out unlocked iphones on www.unlockediphones.net.
600
Yes
No!