I am really interested in buying a Blackberry Strom. I live in the UAE, and they haven't released it here yet. But they're selling unlocked ones so that it can work on any service provider. Does that mean that I could still update the software and it won't lock again?
danielx's advice is incorrect. The vendor.xml file has nothing to do with the locked / unlocked status of your phone. It is only necessary to delete the vendor.xml file from your PC if you are installing an OS from a carrier other than your own. As is stated above, unlocking is a one-time, irreversible event.
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