AT&T 5G Wireless:
High and Low-Band Channels.
Various forms of 5G Wireless are available from AT&T and 5G mobile coverage on Low-Band (at 850 MHz), is available in most markets.  AT&T also offers "5G+" on High-Band which provides their highest download speeds on very high frequency channels, with very limited coverage. AT&T also has a few areas of Mid-Band coverage. 
AT&T also currently offers High-Speed Internet via conventional Fixed Wireless in certain markets.

► AT&T 5G Wireless Coverage

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Dish 5G Wireless:
Low and Mid-Band Channels
Dish Corporation is building a new wireless network which they claim will be "All-5G".  Initially, they provide service under the Boost Mobile and Ting Mobile brands operating through an agreement with T-Mobile and other roaming partners. They could indeed build their own network which would make 5g Coverage available to Boost and Ting customers, and Dish's own or affiliated brands of wireless. Dish has their own spectrum in both Low and Mid-Band frequencies which have moderate to good coverage and download speeds from better, to much better than, 4G-LTE.

► Dish Wireless Maps

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T-Mobile 5G Wireless:
High and Low-Band Channels, Expanding into Mid-Band.
T-Mobile now offers 5G Wireless in almost all urban markets and many rural areas. They claim service to 200 million people in the US. They are using 600 and 700 MHz ("Low Band") channels for nationwide coverage and additional "High-Band" frequencies (39 GHz) for faster downloads in urban core areas.  Also, T-Mobile has acquired Sprint and is offering combined 5G coverage of the two networks, including Sprint's extensive Mid-Bandcoverage, with a compatible 5G device. T-Mobile will eventually offer a significant mix of Low, Mid and High-Band channels. T-Mobile also offers broadband internet access for the home that uses a mix of 4G LTE and 5G bands..

► T-Mobile 5G Wireless Coverage Maps

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US Cellular 5G Wireless:
Low-Band Channels
US Cellular offers 5G Wireless in several parts of the traditional wireless coverage areas. They are using 600 and 700 MHz ("Low Band") channels for broad 5G coverage including rural areas.  Their 5G is noticeably faster than their 4G - LTE service.

► US Cellular 5G Wireless Coverage

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Verizon 5G:
High-, Low- and Multi-Band Channels
Verizon is offering "Low-Band" 5G Wireless in several cities and 5G Wireless for a fixed location under the name, "Home", in some of those markets. Verizon is using "High-Band" channels at 28 GHz for their "Ultra Wideband" (UW) service, located in small parts of the cities where UW coverage is offered, which has very high download speeds but very limited coverage. Their Low-Band channels, with excellent coverage, uses their existing 800 MHz channels which is also used for other types of service, which, for now, limits the capacity of those channels.

Verizon has chosen to add Ultra Wideband to several NFL stadiums. We bet there are plenty of parking spaces available to see if you can make a fast, 5G connection there.

► Verizon 5G High-Band Coverage

► Sign up with Verizon "Home" 5G. Special Offer: Get 3 months, FREE!

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• LOW-BAND:
  -600 to 2,000 MHz. Extensive coverage, slower downloads.
  
• MID-BAND:
  -2 to 6 GHz. Moderate Coverage, better downloads.
  
  
• HIGH-BAND:
  -6 to 50 GHz (mmWave). Very Limited Coverage, Very Fast Downloads.
  
  
• MULTI-BAND:
  -Various technologies to combine channels to increase bandwidth.

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C Spire 5G Wireless:
C Spire, the largest and most aggressive company among smaller wireless carriers, is offering small pockets of mobile 5G coverage in their Mississippi and border service areas. They also offer 5G "Home" Wireless service in several communities, with 120 Gb fixed wireless internet service connected by fiber to a neighborhood hub. Nearby homes and businesses get a dinner plate-sized antenna and receiver installed for service.