So there is no need for a separate RTC to keep time. If the value returned is 0 it means network time updating is disabled. So even if the modem is restarted CLTS will be enabled.
I have seen in many phones that the time is updated during hand-offs. successfully in products using three different cell modules: Enfora, Telit, and Sierra.
The fact that it uses a character after the AT implies it is a common (as opposed to proprietary) command, and should be available on most if not all cell modules.
An infrared flash is going to produce a black and white picture and will be visible in the dark.
It produces a dull red glow that is not bright enough to catch your attention in the dark but if you looked right at it, it would be visible.
I want to know what AT command should be sent to the modem to get time? But I need to set it automatically through cell tower.