[et_pb_section bb_built=”1″][et_pb_row][et_pb_column type=”4_4″][et_pb_text _builder_version=”3.17.6″] How To Learn From The O2 Mobile Outage   More than 32 million mobile customers lost their cellular service yesterday and had to resort to Wi-Fi.    O2 says a complete and comprehensive root cause analysis is still in progress but it is thought to be due to an expired certificate […]