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	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.
	2	+
	3	+Below is the definition for the AT+CSQ
	4	+
	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"]]
	6	+
	7	+CSQ Definition
	8	+
	9	+In this case, you can check:
	10	+
	11	+* Whether the antenna connection is good.
	12	+* Whether you use a valid SIM Card
	13	+* Whether you the SIM card place correctly.
	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]]