Viettel miễn phí 7 ngày trải nghiệm cuộc gọi chất lượng cao VoLTE
Tổng Công ty Viễn thông Viettel cho biết đang triển khai chương trình ưu đãi nhằm nâng cao trải nghiệm dịch vụ thoại và dữ liệu di động cho người dùng.
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