Building and generating 5G products in-house empowered Viettel to actively roll out 5G for their cellular community and linked products and services.Smart Sim c?a Viettel ??n nay, Viettel Telecom ???c cho là ?ã ghi ???c nh?ng d?u ?n quan tr?ng và m?t v? th? l?n trên th? tr??ng c?ng nh? trong s? l?a ch?n c?a khách hàng:People are the driving d