Good question; I wouldn't mind the SIM-lock, but A1 does a lousy job providing new formware version for Nokia phones. Is there a mechanism in the N900 that could prevent me from updating to a new Maemo release (flash or SSU) if the carrier doesn't want me to? I had this situation with my current phone, needed to change product code etc. ... Does the N900 even have a thing such as a "prduct code"?