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When someone calls you on their phone, whether a land line or a cell phone, it takes approximately .6 seconds to send the signal to the local central telephone office. The central office sends out a signal to all the local cell towers that sends out a signal. If one or more towers sense your location is near, the nearest one will make contact and make your phone ring completeing the connection. If you are out of range of the local towers, the signal is sent to further and further groups of towers until your phone is found. the total time to find you is approximately 1.2 seconds. If finds you when you when you power up your phone and keeps track of you as you move (whether you make or get a call). When you power up your phone, it checks into the network by transmitting its ID. Either you get in or you don't. If not, no service. If you get in, and it's not your network, you're roaming and you're in (but you're told you're roaming). If you get in, and it's your network, you're in. When you're in, the computer knows where you are when you check in. It also keeps track of you when you move via the switching controller/computer. Even if you are moving and do not make or get a call, your location is tracked. If you do get a call, the cell you are in is already know to the control system, so it doesn't have to "send(s) out a signal to all the local cell towers" to connect you. It hits that cell that you are in and your phone rings. (Got a good ringtone loaded up, hmm?)

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17y ago

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