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A typical SIM card (mini-SIM with micro-SIM cutout) A SIM card or SIM (Subscriber Identity Module) is an integrated circuit (IC) intended to securely store an international mobile subscriber identity (IMSI) number and its related key, which are used to identify and authenticate subscribers on mobile telephone devices (such as mobile phones and laptops).
'MobiFone Telecommunications Corporation') is a major Vietnamese mobile network operator headquartered in Trung Hoa Nhan Chinh, Hanoi. Founded on 16 April 1993, as a Global System for Mobile Communications launcher, MobiFone is the second largest telecommunications provider in Vietnam (2023).