Nhu cac ban da biet. 9119 la tin nhan mien phi cua viettel dug de ngi nguoi khac goi lai cho minh.
Neu nhu binh thuong thi cac ban co the gui them 20 ki tu dang sau so dt cua nguoi minh de ngi goi la lai.
Gio day voi 1 cach that don gian minh co the gui duoc 160 ki tu dang sau sdt nguoi nhan ma nguoi nhan van nhan dc day du khong thieu 1 ktu nao neu nhu cac ban lam dung theo cach minh sap noi duoi day.

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