Try htcimeiunlock.com. I have used them successfully several times -- including for my AT&T-branded Titan.
You can enter the IMEI on their web site and they'll tell you immediately whether they have a code or not. I actually did that before I even finished the check-out procedure as I was buying the Titan at a Microsoft Store (didn't want to take any chances).
You can enter the IMEI on their web site and they'll tell you immediately whether they have a code or not. I actually did that before I even finished the check-out procedure as I was buying the Titan at a Microsoft Store (didn't want to take any chances).