Remember that Band I (2100 - IMT) is composed of the upstream 1900 MHz frequency range we use here for Band II (PCS), and the downstream 2100 MHz frequency range we use here for Band IV (1700 - AWS). While the Moto G does support both of those frequency ranges, you cannot automatically assume that its radio will work on Band I. If it has not been explicitly designed to recognize that band, then it will recognize downstream 2100 MHz signals but unsuccessfully attempt to respond at 1700 MHz.
Since the AWS model does not list Band I as an HSPA frequency it is best to assume that it will not work on Band I.
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