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4Overview
Status LEDs
The MD400 and MD400g contain multi-colored LEDs that indicate the status of the device. The
LEDs are located next to the antenna, as shown below.
Note:
On the MD400 both LEDs are Mobile Service LEDs.
SIM Card
When you subscribe to a mobile network, you are issued a Subscriber Identity Module (SIM) card.
Your SIM card contains your personal subscriber data. To connect to a mobile network you must
first insert your SIM card, that includes the appropriate network subscription, into your MD400.
LED Color Flash rate Description
1 - GPS
(MD400g only)
Yellow Fast Searching, position not fixed
Yellow Slow Position fixed
Off GPS off
2 - Mobile Service Red Fast Searching for a mobile network
Green Medium Registered to GPRS or EDGE service, not
connected
Green Slow Connected - GPRS or EDGE service
Blue Medium Registered to UMTS or HSPA service, not
connected
Blue Slow Connected - UMTS or HSPA service