Samsung has launched the B5722 Duos, its first touchscreen device in its dual-SIM range of handsets. What’s unique about this dual-SIM device by Samsung is that it lets users preset the SIM change-over time. Apart, from setting a fixed time for SIM-switching, users can also use the dedicated key for switching between the two connections. The device has a 2.8-inch QVGA resistive touchscreen display, a 3.0 MP camera...