Optimum Mobile leverages T-Mobile 4G LTE and 5G networks. T-Mobile has America's largest 5G network with more 5G bars in more places. Fastest: Based on median, overall combined 5G speeds according to analysis by Ookla® of Speedtest Intelligence® data 5G download speeds for Q2 2022. Most Reliable: According to an audit report conducted by independent third-party umlaut containing crowdsourced data for user experience including task completion collected from November 2021 to May 2022. Full details at: www.umlaut.com/en/benchmarking/USA. 5G capable device required; 5G not available in all areas.