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Overview
When properly installed, the USB551L Modem is a highly reliable product. Most problems are
caused by one of these issues:
• System resources required by the modem are being used by other devices.
• Network coverage is unavailable due to coverage area, an account problem, or a network
problem.
The following tips can help solve many common problems encountered while using the USB551L
Modem.
First Steps
• Make sure you are using the device in the correct geographic region. Be sure you have 4G
Mobile Broadband and Mobile Broadband service with the USB551L Modem in the U.S.
• Ensure that your wireless coverage extends to your current location.
• Ensure you have an active subscription plan.
• Restarting your computer and your modem can resolve many issues.
IMPORTANT Before contacting support, be sure to restart your computer, and remove and
reconnect your device.
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