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Band 77

One of the main frequency bands for mid-band 5G networks in the US.

See: 5G

It is a relatively large band that includes C Band, the 3.45 GHz band, and the 3.5 GHz band (CBRS / band 48).

See: C Band


Each of these smaller bands covered by band 77 have their own layout and rules, but all are unpaired bands using TDD.

See: TDD

Because some of these smaller bands operate by very different and complicated rules, there is unfortunately not just one "band 77" that ensures compatibility, as with other bands. A phone that supports 5G in band 77 may support just the C-Band, but not the 3.45 GHz band, for example, even though the 3.45 Ghz band is technically within the frequencies band 77 is intended to cover.

To denote these differences, the 3.45 GHz band is sometimes written as band "77-A", or "77 (DoD)", (since these frequencies were previously used by the US Department of Defense.) Similarly, the C-Band is sometimes indicated as band "77-C".

Band 77 spans 3.3 – 4.2 GHz, although only 3.45 – 3.98 GHz is used in the US.

Last updated Sep 8, 2022 by Rich Brome

Editor in Chief Rich became fascinated with cell phones in 1999, creating mobile web sites for phones with tiny black-and-white displays and obsessing over new phone models. Realizing a need for better info about phones, he started Phone Scoop in 2001, and has been helming the site ever since. Rich has spent two decades researching and covering every detail of the phone industry, traveling the world to tour factories, interview CEOs, and get every last spec and photo Phone Scoop readers have come to expect. As an industry veteran, Rich is a respected voice on phone technology of the past, present, and future.

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