Background

Mobile phones use a technology called cellular networking. The phone is basically a two-way radio, similar to a walkie-talkie. When a mobile calls another phone, it communicates using its radio to something called a base station. This is a large radio receiver and transmitter which routes the call to the rest of the phone network.

Base stations typically transmit over a circular area around 10 square miles in diameter. These overlap slightly, so a phone can usually communicate with several different "cells", and tends to use the one with the strongest signal - i.e. the closest (although this can be affected by tall buildings etc).

A database records information on all mobile calls made, and can store the name of the cell which the caller was in when they made the call. This can be used to support or cast doubt on a suspect's alibi.

This information can be used in investigations to see not only who has called whom and when, but also WHERE the caller was when making the call.

Review the training materials to the left.

For this operation you should follow these steps:

1. Download the phone records database from the left and save it to your own file area.
2. Create a query that shows all the calls made TO the number 07700900432.
3. Create a query that shows all the calls made FROM the number 07700900432.
4. Create a report that shows the results from the query in 2) above.
5. Create another report that shows the results from the query in 3) above.
6. Watch out for late breaking information which will pop up from this page. Follow the instructions received. DO NOT CLOSE THIS PAGE until you see the popup and follow its instructions.