Who Will Use C-Band?

Generally, AT&T and Verizon.

The C-band frequencies will become available in two chunks. The first 100MHz are now available in 46 major markets across the US, covering about 60% of the US population. Verizon and AT&T split those "A block" airwaves 60/40. So Verizon will be just above, and AT&T just under, the 50MHz rule of thumb I've been using for real 5G differentiation.

Whether you'll be able to use it yourself requires them to build out their cell sites, but they'll have the spectrum.

The other 180MHz in the C-band is only scheduled to be cleared by the end of 2023. That includes more Verizon and AT&T spectrum, along with airwaves purchased by T-Mobile, US Cellular, and some local phone companies. At that point, Verizon will end up with an average of 160MHz of spectrum and AT&T with an average of 80MHz—both able to deliver a truly different 5G experience.

For more information:

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https://www.pcmag.com/news/what-is-c-band