Actually, this analysis is only correct with respect to phones purchased on or after October 28, 2012. Pursuant to the Copyright Office's most recent interperation with regards to unlocking phones, the unlock limitation applies only to "newly purchased" phones, defined as phones purchased on or after October 28, 2012 plus a 90-day grace period. This phone was purchased on September 21, 2012 (the release date) and thus is not subject to that limitation. Furthemore, it would also qualify under the grace period. Consequently, this phone is unlock-eligible without carrier permission, even during the contract period.
However, if my request violates the individual forum's policies (although I can't see why, given the fact it is not in fact illegal), I retract my request for help. I would delete my posts, but I cannot.
A PDF copy of the decision is available here: https://s3.amazonaws.com/public-inspection.federalregister.gov/2012-26308.pdf (see Page 16; "In order to align the exemption to current market realities, it applies only to mobile phones acquired prior to the effective date [stated on page 1 as October 28, 2012] of the exemption or within 90 days thereafter." - meaning that it IS lawful to unlock the phone if purchased before the effective date)