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While the top 3 wireless providers operate nationwide wireless networks which cover most of the population in the United States, U.S. Cellular and other smaller carriers provide native network coverage across selected regions of the United States while supplementing nationwide coverage through roaming agreements with other carriers.

Cellular network. A cellular network or mobile network is a communication network where the link to and from end nodes is wireless. The network is distributed over land areas called "cells", each served by at least one fixed-location transceiver (typically three cell sites or base transceiver stations ). These base stations provide the cell ...

A mobile phone signal (also known as reception and service) is the signal strength (measured in dBm) received by a mobile phone from a cellular network (on the downlink ). Depending on various factors, such as proximity to a tower, any obstructions such as buildings or trees, etc. this signal strength will vary.

A coverage noticer is a device that beeps (or vibrates) when in a zone that lacks coverage ( white spot ). This is fundamental for critical services (security, emergency and so on). When the user goes to a covered area, the noticer ceases beeping.