This document is a report detailing the 2024 Claims Substantiation by RootMetrics®, an independent mobile analytics firm. The report aims to provide a comprehensive view of mobile network performance across the UK, including assessments of major operators such as EE, O2, Three, and Vodafone. It outlines the methodology used for data collection, which involves extensive testing in various urban areas and across different UK nations. The report emphasizes the importance of reliability, accessibility, and speed in mobile network performance, as reflected in the RootScore® system. RootScores are derived from multiple tests and are designed to represent the consumer experience accurately. The report also discusses the statistical methods employed to ensure unbiased rankings of network performance, including confidence intervals and the bootstrap t-test. Overall, the report serves as a resource for understanding mobile network performance metrics and consumer experiences in the UK.