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# Configure the dial string for placing calls as 666666.
[Router-Eth-channel2/4/0:0] dialer number 666666
Troubleshooting
Symptom
A 3G/4G modem fails to function correctly. For example, the 3G/4G modem receives no signals or
fails to connect to service providers' networks.
Solution
To resolve the issue:
1. Execute the
shutdown command and the undo shutdown command on the cellular
interface.
2. If the 3G/4G modem still fails to function, execute the
modem reboot command on the cellular
interface.
3. If the issue persists, contact H3C Support.
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