Huawei E397 - Indicator; 4 G LTE SIM Card Slot

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 Indicator
It indicates the status of the USB Wireless Modem.
 Green, blinking twice every 2s: The USB Wireless Modem is powered on.
 Green, blinking once every 0.2s: The software of the USB Wireless Modem is being
upgraded.
 Green, blinking once every 2s: The USB Wireless Modem is registering with a CDMA 1X
network.
 Blue, blinking once every 2s: The USB Wireless Modem is registering with a 3G network.
 Cyan, blinking once every 2s: The USB Wireless Modem is registering with a 4G LTE
network.
 Green, solid: The USB Wireless Modem is connected to a CDMA 1X network.
 Blue, solid: The USB Wireless Modem is connected to a 3G network.
 Cyan, solid: The USB Wireless Modem is connected to a 4G LTE network.
 Off: The USB Wireless Modem is removed.
 4G LTE SIM Card Slot
It holds a 4G LTE SIM card.