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Receiving NO CARRIER message
There are some common cases when modem answers NO CARRIER:
• If data/voice/fax connection cannot be established
• Right after hanging up the data/voice/fax connection
• If there is no connection with network – check antenna and registration status (see
registration
Network
• If there is no power supply (see
If the modem answers NO CARRIER in some cases, you can have an extended error
code using AT+CEER. The table below shows some of codes which can appear.
Error code
1
3
6
8
16
17
18
19
21
22
27
28
34
38
41
For further information about AT commands and their usage, refer to [1].
24
)
Unassigned or unallocated number
No route to destination
Channel unacceptable
Operator determined barring
Normal call clearing
User busy
No user responding
User alerting, no answer
Call rejected
Number changed
Destination out of order
Invalid number format (incomplete number)
No circuit/channel available
Network out of order
Temporary failure
Power supply
)
Description
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Troubleshooting
