You know, you are probably right. However, they don't mention any other carrier, and when I put that model number in google here is what I get:
HTC6445LVW Could Be Next-Gen DROID DNA Or Verizon?s HTC One | TalkAndroid.com
I kind of like that case, and have searched for a generic version or one for Att, and I can't find one. It is unique in that it has a separate attached piece for the stand and what looks like a small magnetic closure. It might not wrinkle unevenly in the back like others. But it is for Verizon HTC One only, boo hoo.