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codes--hopefully this reduces, not increases confusion
==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==
Cellular phones use a number of different codes to identify themselves and the user's account, and function on the network properly. These include the following.
{| class="wikitable"
|-
!Acronym !! Meaning !! Description
|-
| 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>
|-
| 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)
|-
| 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>
|-
| MIN ||Mobile Identification Number||Identifies the service plan and user<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">http://electronics.howstuffworks.com/cell-phone3.htm</ref>
|}
==Safety Record==
==Safety Record==