We've been down this road before: a new iOS version is released that undoes all of the nasty stuff hackers did to the previous version. A week later those same hackers blow out a jailbreak and then a few days later they release a full unlock (the latest iOS unlock is only for 3G and 3GS right now, so iPhone 4 users are stuck for now.) Given that this is pretty much standard procedure, why don't carriers just give up?
Sadly, most other phones don't get this sort of white glove treatment. A grey market exists that traffics in phone unlocks for many devices including Blackberries and Nokias. Why? Because someone, somewhere wants to move their phone from country A to country B. The vast majority of phone users will never want to this but there is still plenty of demand.
So why not ship without the lock? Well, there are a few possible answers, barring the obvious "Carriers suck."
Phone SIM Locks: Why Do Carriers Even Bother?
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