Cosmote, Greece's largest mobile network provider, leverages Grafana Enterprise to enhance observability in its billing systems, transforming previously time-consuming manual processes into efficient, real-time data visualization. This shift has enabled Cosmote to track business metrics, revenue, expenses, and potential fraud, with automated alerts for any anomalies. Initially adopted by the billing team, Grafana's capabilities have expanded across five business and IT teams, involving at least 35 individuals who monitor various dashboards. Beyond financial monitoring, Grafana played a crucial role during the Covid-19 pandemic by facilitating real-time tracking of government SMS notifications about vaccination campaigns. The integration of Grafana has been pivotal in driving Cosmote's revenue, improving business operations, and increasing company-wide visibility, with a senior analyst likening its impact to "a light" in an otherwise dark cave.