There's conflicting news about what's going on with the HTC Inspire 4G. Some sources claim that the HTC Inspire 4G is unequipped for HSUPA while others say the feature is simply disabled by AT&T.
AT&T sources claim that the HTC Inspire 4G does not have HSUPA. This is contrary to what other sources from Engadget believe stating that it is very rare for an HSPA+ chipset to not support HSUPA. Sources from the site believe that a firmware update for the device would enable HSUPA.
If the latter claim is true, it is uncertain why the feature is not enabled. AT&T has yet to respond with further information other than their initial denial that the device was not capable of supporting HSUPA.