Mobile: This file is based on a snap shot of data provided by the largest mobile operators in the UK for the period of June 2014 (3G and 4G) and March 2014 (2G). Due to variations in mobile performance over time, the file should not be regarded as a defintive and fixed view of the UK's mobile infrastructure. However, the information provided in this file may be useful in identifying variations in mobile performance by geography.The file should be viewed in conjunction with the Infrastructure Report published by Ofcom in December 2014, which details how each of the metrics is defined.