There's a lot to discuss.. A LOT.
Unlocking allows a phone from one carrier (AT&T) to be used on a different carrier that uses the same technology.
AT&T and T-Mobile use the same technology. Verizon and Sprint use a different technology.
You can unlock an AT&T Bold and use it on T-Mobile - except you won't get 3G. It's complicated. You can never use a Bold on Verizon.
If you unlock it, you can still use it on your original carrier.
Given the number of questions - there is no reason for you to use the unlock code. It won't expire. And it can only be used once on a specific phone.
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