AWS-1 or UMTS band IV(1700Mhz), is a wireless telecommunications spectrum band used for mobile voice and data services, video, and messaging. AWS-1 is used in Canada, the United States and South America. It replaces the spectrum formerly allocated to Multipoint Multichannel Distribution Service (MMDS), sometimes referred to as Wireless Cable. The service is intended to be used by mobile devices such as wireless phones for mobile data, video, and messaging services.
Many of the above listed HTC phones have more than one version. The consumer must ensure that he or she purchases the correct version that supports the AWS frequency. The HTC Amaze is a distinct exception to that guideline as all versions of that model are AWS compatible.