Changes

==Function==

==Function==

Cellular phones connect to distributed towers holding transceiver cells.  Each phone can operate on about 1,664 different channels.  Territory is divided into cells--sections serviced by a specific tower.  As a phone passes from one cell to another, its connection is switch over to the tower responsible for the newly entered cell.  Each cell is usually a hexagon which covers about 10 square miles.<ref>http://electronics.howstuffworks.com/cell-phone1.htm</ref>

Cellular phones connect to distributed towers holding transceiver cells.  Each phone can operate on about 1,664 different channels.  Territory is divided into cells—sections serviced by a specific tower.  As a phone passes from one cell to another, its connection is switch over to the tower responsible for the newly entered cell.  Each cell is usually a hexagon which covers about 10 square miles.<ref>http://electronics.howstuffworks.com/cell-phone1.htm</ref>

==Codes==

==Codes==

| IMEI || International Mobile Equipment Identity || Identifies a physical phone uniquely on GSM networks<ref name="techwalla-esn-imei">https://www.techwalla.com/articles/the-difference-between-esn-imei</ref>

| IMEI || International Mobile Equipment Identity || Identifies a physical phone uniquely on GSM networks<ref name="techwalla-esn-imei">https://www.techwalla.com/articles/the-difference-between-esn-imei</ref>

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| IMSI || International Mobile Subscriber Identity || Identifies a user and their service plan to the the GSM network<ref>http://www.imore.com/what-is-sim-card</ref><ref>https://www.lifewire.com/what-are-sim-cards-577532</ref> (stored on SIM card)

| IMSI || International Mobile Subscriber Identity || Identifies a user and their service plan to the GSM network<ref>http://www.imore.com/what-is-sim-card</ref><ref>https://www.lifewire.com/what-are-sim-cards-577532</ref> (stored on SIM card)

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| ESN || Electronic Serial Number|| Used by CDMA networks instead of IMEI and IMSI codes to identify the device and service plan<ref name="techwalla-esn-imei">https://www.techwalla.com/articles/the-difference-between-esn-imei</ref><ref name="howstuffworks-phones3">http://electronics.howstuffworks.com/cell-phone3.htm</ref>

| ESN || Electronic Serial Number|| Used by CDMA networks instead of IMEI and IMSI codes to identify the device and service plan<ref name="techwalla-esn-imei"/><ref name="howstuffworks-phones3">http://electronics.howstuffworks.com/cell-phone3.htm</ref>

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| MIN ||Mobile Identification Number||Identifies the service plan and user<ref name="howstuffworks-phones3">http://electronics.howstuffworks.com/cell-phone3.htm</ref>

| MIN ||Mobile Identification Number||Identifies the service plan and user<ref name="howstuffworks-phones3"/>

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| SID || System Identification Code|| Identifies the service carrier network uniquely, enabling connection to the correct network as well as roaming, if permitted.<ref name="howstuffworks-phones3">http://electronics.howstuffworks.com/cell-phone3.htm</ref>

| SID || System Identification Code|| Identifies the service carrier network uniquely, enabling connection to the correct network as well as roaming, if permitted.<ref name="howstuffworks-phones3"/>

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