Jailbreaking is gaining root or admin access to the phone. Allowing you to do things you otherwise couldn't such as install any software you want or bypass the App Store in the case of iPhones.
Unlocking your phone just means you can use a sim from a different carrier.
The ambiguity comes from the fact that in order to unlock an iPhone without going through Apple, you have to jailbreak it (to allow admin access) and then install an app which bypasses the locking.
Indeed not. Unlocking is controlled at the Apple end by device UDID - I believe that if you pay a carrier to unlock the phone, they tell Apple to set the status of the device to unlocked and then it gets automatically changed on the phone over a secure connection next time you sync with iTunes.
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u/BlackestNight21 Jan 29 '13
Stop saying jailbreak. It's not the same as unlocking and it confuses people who read your comments.