For 5G, T-Mobile is using band 71 (600 MHz) for low-band , band 41 (2,500 Mhz) for mid-band, as well as faster mmWave in select downtown areas.
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(600 MHz Band) A radio frequency band near 600 MHz, used for mobile phones starting in 2017 . As a newer band, it is used exclusively for newer technologies such as LTE (4G) and NR (5G). In the US, T-Mobile owns the licenses to most of band 71.
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