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hi mco! welcome to the forums
sounds like you want to unlock your sim card to use the phone on a different carrier,not unlock the bootloader. most carriers will give you an unlock code,if you have an account in good standing.
failing that, ebay lists unlock codes as cheap as 99 cents if you are unable to obtain a working unlock code due to some sort of esn/board mistatch,prolly your best course of action is to take that up with htc. there is no way that i know of to force a simunlock even if s off and rooted.
hope thAt answers your questions
if you do need help with bootloader unlock,we can help you there