... , call divert, call barring;5)Show or hide caller number;6)Lock card, lock national call, lock phone; 7)Large ergonomically designed ... 935-960 Mhz GSM 1800: i) Transmission: 1,710-1,785 Mhz ii) Reception: 1,805-1,880 Mhz2.Normal operation temperature: -30° C ... ---85° C3.Environment noise: below 60dB(A)4.Support SIMCard 1.8V/ 3V5.Channel interval: 200KHz6.Receive sensitivity: <-100dBm7.Relative humidity ...