Huawei E372 - MicroSD Card Slot; SIM;USIM Card Slot

4
 Green, blinking twice every 3s: The USB Stick is powered on.
 Green, blinking once every 3s: The USB Stick is registering with a 2G network.
 Blue, blinking once every 3s: The USB Stick is registering with a 3G/3G+ network.
 Green, solid: The USB Stick is connected to a 2G network.
 Blue, solid: The USB Stick is connected to a 3G network.
 Cyan, solid: The USB Stick is connected to a 3G+ network.
 Off: The USB Stick is removed.
 MicroSD Card Slot
It holds a microSD card.
 SIM/USIM Card Slot
It holds a Subscriber Identity Module (SIM)/Universal Subscriber Identity Module (USIM)
card.