If the LED on the modem is solid red, it usually means there is no signal or the SIM is invalid. A blue or green light indicates a 3G/HSPA signal. Some versions of the

: Easily connect, disconnect, or set the modem to auto-reconnect to 3G/HSUPA networks.

Windows has built-in mobile broadband management. You don't actually need the ZTE software.

: Track your total data consumption and session time to avoid exceeding carrier limits.