According to the results of the interview, some of the customer reviews that current, Viettel has tried to provide customers with the most convenient service, a subscription service more easily. However, the procedure is too cumbersome, difficult to implement, especially for customers have low education level. A customer reflected "to subscribe to Mobile Internet of Viettel, I have to make 2-3 step successfully. Message syntax some free minutes services call difficult to remember, difficult to implement. Therefore, although the wish to use the service, I also don't know how to register
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