mong anh em 4f giup dum minh con 5300,gan sim vao khoang 5-10 phut moi nhan mang,song day nhung khi goi thi khong duoc(co luc thi bao"loi thuc hien"????)minh phai bat dau tu dau,xin duoc giup do...cam on moi nguoi truoc.