Tim hieu them ve chuc nang VCall V939

Toi vua mua chiec dt Vcall V939 , muon hoi 1 so van de sau: 1/ Che do khoa phim tu dong cho thong so tu 5s, 30s, 1' , 5' . Khi toi cai 5s thi phai 10s sau moi tu dong khoa , vay cho Toi hoi muon tu khoa bang phim nong co hay khong ? de Toi khoi phai mac cong cho. 2/ E-Book Reader phai la tap tin co duoi gi moi doc duoc ? thi du *.pdf ; *.pcr ... 3/ Ky hieu not nhac o tren goc trai man hinh (ke ben tin hieu song ) la bao chuc nang gi ? 4/ Vao system co muc " Phim Tat " xin cho hoi cach su dung ? Vi khi mua chi nhan duoc 1 to huong dan su dung dt va ghi rat chung chung cho tat ca cac loai dt cua Vcall , khong co huong dan cu the cho may V939 nen toi phai hoi, rat mong nhan duoc su quan tam va tra loi cua Cty cung nhu Vatgia.com . xin cam on