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1	1	When you use NB-IoT module and run the command AT+CSG=99,99. It means the device doesn't attached to the NB-IoT network. If attached to network, the first 99 should be 2~~31.
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3	3	Below is the definition for the AT+CSQ
	5	+)))
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5	5	[[image:https://wiki.dragino.com/images/thumb/5/5d/NB-IoT-CSQ_11.png/600px-NB-IoT-CSQ_11.png||height="644" width="600"]]
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12	12	* Whether you use a valid SIM Card
13	13	* Whether you the SIM card place correctly.
14	14	* Whether the NB-IoT Network you use match the End Device Module support network.
15		-* Whether you have select the correct band for your operator. See [[Specify_NB-IoT_Band>>url:https://wiki.dragino.com/index.php/Specify_NB-IoT_Band]]
	17	+* Whether you have select the correct band for your operator. See [[Specify_NB-IoT_Band>>http://8.211.40.43:8080/xwiki/bin/view/Main/Specify%20NB-IoT%20Band/]]