You can email HTC and have them change your in game handle to whatever you wish (or phone if you prefer).
The only catch is that if you change your handle you will lose all your perks, and have to earn them back. For some its a big deal, some don't care about perks. Your perks are tied to your handle, that is why you lose them.
Hope this clears it up for you .
Cheers,
RTR