This article describes how to connect to the AT&T Network.
INSTRUCTIONS & INFO
Slide the ON/OFF switch to the ON position to turn the device on. The Power light on the front of the device will turn green. Note: The account must be active and provisioned with an appropriate voice/data plan and the device must be located within AT&T network coverage.
The Signal Strength LED will show the current connection status. Note: The LED will display green if the AT&T Wireless Internet is receiving a LTE signal, blue if it is receiving a 3G/4G/HSPA+ signal, red if it is receiving no wireless signal or a SIM error.