Phone SIM Locks: Why Do Carriers Even Bother?

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?

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