Iphone LOCK or UNLOCK, which is cheaper?

I want to buy iphone 4 or 4s. I'm in USA. Which is cheaper and where can I buy it?

If you buy a locked phone you need to also buy the key to unlock its pad. Think about it: When you're using your phone do you want to be able to call someone directly or do you need a key to unlock the locked iPhone to call people? Why get waiting for it? Get an unlocked iPhone today!

Apple iPhone
Source(s):
http://www.amazon.com/...=yhs001-20

Locked ones are cheaper.

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