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- Mobile_phone_signal abstract "A mobile phone signal (also known as reception and service) is the signal strength (measured in dBm) received by the mobile phone from the cellular network (on the downlink). Depending on various factors, such as proximity to a tower, obstructions such as buildings or trees, etc., the signal strength will vary. Most mobile devices use a set of bars of increasing height to display the approximate strength of the received signal to the mobile phone user. Traditionally five bars are used; see five by five.Generally, a stronger mobile phone signal is easy to obtain in an urban area, though urban areas do have some "dead zones" where no reception can be obtained. Since cellular signals are designed to be resistant to multipath issues, this would most likely be due to blocking by a large building such as a high-rise. On the contrary, many rural or minimally inhabited areas lack a signal or have a very weak fringe reception; many mobile phone providers are attempting to set up towers in parts of these areas most likely to be occupied by users, such as along major highways. Even some national parks and other popular tourist destinations away from urban areas now have cell phone reception, though location of radio towers in these areas is normally prohibited or strictly regulated, and is often blocked by mountains (where parks are often located).In an area where signal reception would normally be strong, certain other factors may have an effect on the reception, thereby making it either stronger or weaker, or may cause complete RF interference. For example, a building with thick walls or of mostly metal construction (or with dense rebar in concrete) may prevent a mobile phone from being used. Underground areas, such as tunnels and subway stations, lack reception unless they are wired for cell signals. There may also be gaps where the service contours of the individual base stations of one's mobile carrier (and/or its roaming partners) do not completely overlap.Additionally, the weather may affect the strength of a signal, due to the changes in radio propagation caused by clouds (particularly tall and dense thunderclouds which cause signal reflection), precipitation, and temperature inversions. This phenomenon, which is also common in other VHF radio bands including FM broadcasting, may also cause other anomalies, such as a person in San Diego "roaming" on a Mexican tower from just over the border in Tijuana, or someone in Detroit "roaming" on a Canadian tower located within sight across the Detroit River in Windsor, Ontario. These events may cause the user to be billed for "international" usage despite being in their own country, though mobile phone companies can program their billing systems to re-rate these as domestic usage when it occurs on a foreign cell site that is known to frequently cause such issues with their customers. The volume of network traffic can also cause calls to be blocked or dropped due to a disaster or other mass call event which overloads the number of available radio channels in an area, or the number of telephone circuits connecting to and from the general public switched telephone network.".
- Mobile_phone_signal thumbnail Mobile_phone_signal.png?width=300.
- Mobile_phone_signal wikiPageID "13913552".
- Mobile_phone_signal wikiPageRevisionID "606596356".
- Mobile_phone_signal hasPhotoCollection Mobile_phone_signal.
- Mobile_phone_signal subject Category:Mobile_telecommunications.
- Mobile_phone_signal subject Category:Radio_electronics.
- Mobile_phone_signal comment "A mobile phone signal (also known as reception and service) is the signal strength (measured in dBm) received by the mobile phone from the cellular network (on the downlink). Depending on various factors, such as proximity to a tower, obstructions such as buildings or trees, etc., the signal strength will vary. Most mobile devices use a set of bars of increasing height to display the approximate strength of the received signal to the mobile phone user.".
- Mobile_phone_signal label "Mobile phone signal".
- Mobile_phone_signal sameAs m.03cn22y.
- Mobile_phone_signal sameAs Q17104039.
- Mobile_phone_signal sameAs Q17104039.
- Mobile_phone_signal wasDerivedFrom Mobile_phone_signal?oldid=606596356.
- Mobile_phone_signal depiction Mobile_phone_signal.png.
- Mobile_phone_signal isPrimaryTopicOf Mobile_phone_signal.