unlocked can also mean unlocked bootloader if your planning on rooting and installing custom roms with a custom recovery. At the XDA forum there is a ton of information available if you search the different sections. But, the thing is over there , if you get into trouble they don't help as much as they do here , they tell you to search and read then read some more. The link
Verizon HTC One - xda-developers. You probably can find in there guides and information on unlocking and rooting if thats your intentions plus custom roms for your enjoyment. I don't go to that forum and read as mine is ATT and the diffenent carriers are different on mods