From the CoA doc:
Each mobile telephone making or receiving a call does so by way of a radio signal, which is routed through one of many local transmitters, commonly called 'cell sites', which provide a general coverage throughout the country. Skilled interrogation and analysis of the computer records will show the cell site through which each outgoing and incoming call made from or to a mobile telephone was routed. In order to make the information intelligible and relevant to the issues in the case, a selection of these calls, with this information, was incorporated into agreed schedules.We have in the course of our narrative already referred to many of these calls. However two specific calls require detailed examination and investigation. Both calls were made from Whomes' mobile to Nicholls' mobile on the evening of 6th Dec; both calls were made at 18.59. The first call was made at 18.59.21, the outgoing call was routed through the Ingatestone cell site, this call lasted one second. The second call was at 18.59.32, the outgoing call was routed through the Hockley 3 cell site, this call lasted 4 seconds.
It seems then other calls were viewed against masts?
sika do you know anything about this?