This tutorial walks through the MicroCell requirements.
INSTRUCTIONS & INFO
To use the AT&T MicroCell, you will need:
Fixed broadband internet service such as AT&T U-verse, DSL, fiber or cable. Note: Download speeds of a least 1.5Mbps and upload speeds of at least 256Kbps are required. Not compatible with satellite and wireless broadband.
A dedicated Ethernet port available on your modem or router.
Computer with Internet access to activate your device.
Device must be able to access a Global Positioning System (GPS) signal to verify the device location. Note: Installation near a window is strongly recommended.
AT&T 3G, 4G, or 4G LTE wireless handset.
A myAT&T account is required for activation. Note: If you do not have a myAT&T account, you can register here.