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The following description is provided by the FCC:
The availability data shown on the map are submitted by ISPs through the FCC's Broadband Data Collection (BDC). As part of the BDC, all ISPs must file data with the FCC twice a year on where they offer mass-market Internet access service using their own broadband network facilities.
ISPs offering broadband Internet to fixed locations (such as homes and small businesses) must report where they offer service on a location-by-location basis - the same location points you see on the map - which come from the Fabric.
Mobile providers generate the 3G, 4G LTE, and 5G-NR coverage areas shown on the map using propagation modeling, where the models include certain common settings for consistency. The coverage areas are meant to represent the areas where a user should be able to establish a mobile connection, either outdoors or moving in a vehicle, and achieve certain upload and download speeds. Please note that the map does not include information on the availability of mobile wireless broadband service while indoors. Moreover, because the coverage map is based on propagation modeling, a user’s actual, on-the-ground experience may vary due to factors such as the end-user device used to connect to the network, cell site capacity, and terrain. The coverage maps on mobile wireless service providers’ websites may be based on different parameters and assumptions, such as service availability provided through roaming agreements, and therefore may differ from the information shown here.
All providers must report data as of June 30 (due September 1) and December 31 (due March 1) each year.
Note: Voice coverage areas represent where customers should expect to make and receive mobile voice calls and send and receive texts over the 4G LTE network, without regard to throughput speed. 4G LTE data service meeting a 5/1 Mbps minimum speed may not be available in areas where only voice coverage is shown on the map.