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BASIC OPERATIONS
AT+CEREG?
If the device returns:
+CEREG: 0,1
or
+CEREG: 0,5
The device is registered.
If the device returns:
+CEREG: 0,2
The device is in a network searching state.
Verifying that the Device Detects a Valid SIM Card
Use the query SIM status command to verify if the device detects the SIM card. To do this, enter:
AT+CPIN?
If the device returns:
+CPIN: READY
OK
The device is registered. If your device does not reply with this response, verify that the SIM card is properly
inserted.
Note:
Always insert or swap out a SIM card with the device powered off. Swapping the SIM card with the
device on could lead to issues such as lack of SIM detection or interaction.
When the device fails to connect
Work through the steps below until your device connects.
1.
Wait 30 seconds and try again.
2.
Wait 1 minute and try again.
3.
Wait 2 minutes and try again.
4.
Wait 8 minutes and try again.
5.
Make one attempt every 15 minutes for an hour.
6.
Make one attempt every 90 minutes.
When a call drops
If a connected call drops for any reason: Wait 30 seconds and restart the sequence again.
26
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QuickCarrier
USB-D MTD-MAT1 User Guide
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