Wirelessly posted (8700g: BlackBerry8700/4.1.0 Profile/MIDP-2.0 Configuration/CLDC-1.1 VendorID/100)
While the unlocking policy varies from carrier to carrier, most will do it for free after you have had an account in good standing for 90 days. Otherwise, yes, a third party paid service is required and they can charge what they wish as the market allows. There are several reputable unlocking vendors as sponsor/advertisers of this forum you might try.
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