Not only have the impact of creating the community call in Hanoi, the Hanoi MobiFone's customers can also create the same Intercity network in the community when they encourage relatives, friends in the provinces, other cities use MobiFone. In other words, the promotion called 10 charge 1 is valid only within the geographic area of Hanoi but its impact spread to all other areas by the nature of the links of the mobile network.
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