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And, some NMT-450 analog networks have been replaced with digital networks using the same frequency. In Russia and some other countries, local carriers received licenses for 450 MHz frequency to provide CDMA mobile coverage area. Many GSM tri-band and quad-band phones, or world phones; with such a phone one can travel internationally and use ...

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.

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.

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.