... Mobifone) and small three providers (Gtel, Sfone and Vietnammobile) * Viet Nam Telecom Services Company (Vinaphone) As a member unit of Vietnam Post and Telecommunications Corporation (VNPT), in ... 47,4 million subscribers * Viet Nam Mobile Telecom Services Company (VMS - Mobifone) Vietnam Mobile Telecom Services Company - VMS, a state-owend company under Vietnam Posts and Telecommunications ... telecom Corporation (Vietnammobile) x APPROVAL SHEET This Dissertation , entitled “FACTORS AFFECTING CUSTOMER LOYALTY IN MOBILE COMMUNICATION SERVICES IN HANOI, VIETNAM”, prepared and submitted...