Page "Universal Mobile Telecommunications System" Paragraph 13

The specific frequency bands originally defined by the UMTS standard are 1885 – 2025 MHz for the mobile-to-base ( uplink ) and 2110 – 2200 MHz for the base-to-mobile ( downlink ).

In the US, 1710 – 1755 MHz and 2110 – 2155 MHz are used instead, as the 1900 MHz band was already used.

While UMTS2100 is the most widely deployed UMTS band, some countries ' UMTS operators use the 850 MHz and / or 1900 MHz bands ( independently, meaning uplink and downlink are within the same band ), notably in the US by AT & T Mobility, New Zealand by Telecom New Zealand on the XT Mobile Network and in Australia by Telstra on the Next G network.

Some carriers such as T-Mobile use band numbers to identify the UMTS frequencies.

For example, Band I ( 2100 MHz ), Band IV ( 1700 / 2100 MHz ), and Band V ( 850 MHz ).