Cell site analysis is a forensic analysis technique used to establish which cell towers a mobile phone has connected to, in order to determine the location of the smart phone at a given time. This is typically accomplished by triangulating the last cell towers the phone connected to. In most cases this involved the examination of Call Data Records (CDRs) that have been obtained from mobile phone carrier such as an AT&T, Verizon, Sprint or T-Mobile. Cell Site Analysis can be used in criminal investigations to analyze the location data of a mobile device. This technique involves analyzing the signal strength and other data from cell towers to determine the approximate location of a mobile device at specific points in time. Cell site analysis and Call Data Records can be used to provide evidence in criminal investigations by helping to establish the location of a suspect or victim at a particular time, or to track the movements of a suspect. It can also be used to refute or support an alibi, or to corroborate other evidence in a case.