Minutes of Usage Indosat. One of the telecommunications service providers and telecommunications networks in Indonesia. Indosat Tbk (ISAT) recorded an increase in revenue throughout the first semester of 2020 in line with improved operational performance. In the six months period ended June 29, 2020, ISAT recorded a 9.4% increase in revenue year on year (yoy) from IDR 12.29 trillion to IDR 13.45 trillion.