What does it means if the physical interface state of a 3G Cellular interface is Down

If the physical state of a 3G Cellular interface is Down, the 3G link is not established at the time and the data service does not run yet, which means that the dial-up is not performed or fails on the 3G link.

In this case, the physical interface state of the 3G Cellular interface is down even a 3G data card (3G modem) is inserted into the device.

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