More than 89,600 mobile subscribers spreading spam were blocked in the last six months of 2020. (Photo: VNA) Hanoi (VNA) – Five major mobile service providers - Viettel, VinaPhone, MobiFone, Vietnamobile, and the virtual network I-Telecom blocked more than 89,600 mobile subscribers spreading spam calls in the last six months of 2020, according to the Department of Telecom under the Ministry of Information and Communications. In December 2020 alone, the providers handled 17,290 subscribers, of which 7,844 by Viettel (45 percent), 7,301 by VinaPhone (42 percent), 1,155 by MobiFone (7 percent), 868 by I-Telecom (5 percent), and 122 by Vietnamobile (1 percent). A representative from the department said that in the future, it will work closely with the mobile service suppliers to