The legality of certain phone modifications in the United States, particularly those that allow phones to be used on wireless carriers for which they weren't originally intended, is currently on a congressional see-saw. Every three years, the Librarian of Congress has to approve or extend an exemption of the infamous Digital Millennium Copyright Act (DMCA) to allow or deny consumers the right to unlock (read: carrier unlock, and in some cases rooting/jailbreaking, but not unlocking bootloaders) their phones by circumventing digital rights management.
This is an excellent deal for anyone looking to pick up a new handset without having to sign up for a two-year commitment with a wireless carrier. You can grab a carrier-unlocked HTC Inspire 4G (GSM) for $350 from eBay right now. This may seem a bit steep compared to the relatively low price that you can nab this handset for in-store or for one of the third party manufacturer - until you remove the contract from the equation, that is.