It's possible. Indonesia has 7 cellphone carriers with their own infrastructure, and I think 5 of them have national coverage. Used to be more but the number got reduced over time due to mergers and acquisition. I won't be surprised if there would be only 4 major carriers left soon if the largest ones continue acquiring smaller players, which is a bad news because cellular plans used to be very expensive when there were only 3 major carriers and these smaller players brought competition which drastically reduce prices of cellular plans.