RootMetrics revealed the latest performance rankings for the UK's major mobile network operators based on research carried out in the second half of 2015. EE was named the fastest and top overall operator. The BT-owned company earned five out of six RootScore Awards for the UK as a whole. This included wins for overall performance, network speed, mobile internet, call, and text. Three UK ranked first outright in network reliability for the first time and was ranked second overall, but the company was in last place for network speed. Vodafone UK was in third place overall, while O2 UK languished at the bottom of the ranking. Report