Lets begin by breaking down the workings of a wireless network. Wireless networks are simple, yet complex to explain. They are a chain of radio towers. A few miles separate each tower as they form what looks like a vast grid.

The few miles between towers are called cells. That is where the name cell phone comes from. When you make a cell phone call, it searches for a signal from one of these cell towers. Your handset seeks, links and then joins the network. If your handset cannot find a signal you will not be able to make your call.

When you turn your phone on it searches for a SID on the control channel. Should your phone fail to find it, a no service prompt is displayed because it is out of range. However, when your cell finds a SID the two are compared to see if they are a match.

When a match is made your cell realizes that it is working from home base. Should they not match up, your cell phone is roaming. When your phone roams, the system manager that your phone is roaming in networks with your home system.

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