 In Circular No.22/2014/TT-BTTTT dated December 22, 2014, all 11-digit mobile phone numbers will be changed into 10-digit numbers, the Ministry of Information and Communications announced in a recent press release.All 11-digit numbers with prefixes ‘012' of VinaPhone and MobiFone, ‘016' of Viettel, ‘018' of Vietnamobile and ‘019' of GMobile will be converted into 10-digit ones.