3Com Megahertz
56K Global GSM and Cellular Modem PC Card User Guide
Troubleshooting 

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Troubleshooting

Under normal operating conditions, your modem will provide reliable, trouble-free operation in a variety of environments; however, occasionally a problem may arise. This section is designed to help you resolve those problems. Locate the problem in the section labeled "Message" or "Symptom", then read and implement the "Possible Solution".

Modem Setup

Modem Use

GSM Functions

Analog Cellular Functions

Voice Functions