Android Headlines : Cellular coverage has continued to expand across the United States of America with the four national carriers claiming coverage of much of the population. However, cellular networks often have areas of poor or missing coverage, such as when underground or in a certain corner of a building. In such occasions, our smartphones may still have an Internet connection thanks to a nearby Wi-Fi network, but this is not the same as a cellular connection. Luckily for customers of three out of the four national carriers, they run a Wi-Fi calling service.
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