The signal LED on your device indicates the current wireless signal status.
INSTRUCTIONS & INFO
The Signal Strength LED displays the wireless signal strength that the AT&T Wireless Internet is receiving from the AT&T wireless network.
3 or 4 bars indicate that the AT&T Wireless Internet is receiving a strong signal. Note:1 or 2 bars indicates a moderate wireless signal.
Red indicates no wireless signal. Note:Red blinking indicates a SIM card error.
If the Signal Strength LED isred or only 1 or 2 bars arelighting up, move the AT&T Wireless Internet to a different location for best performance. Note: The Signal Strength LED will turn green when connected to LTEor blue if it is connected to HSPA/3G.