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1		-= **Introduction** =
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3		-----
	3	+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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5		-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.
6		-
7	7	(((
8	8	Below is the definition for the (% style="color:blue" %)**AT+CSQ**
9	9	)))
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17	17	(% style="color:red" %)**In this case, you can check:**
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19	19	* Whether the antenna connection is good.
20		-
21	21	* Whether you use a valid SIM Card
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23	23	* Whether you the SIM card place correctly.
24		-
25	25	* Whether the NB-IoT Network you use match the End Device Module support network.
26		-
27	27	* Whether you have select the correct band for your operator. See [[Specify_NB-IoT_Band>>doc:Main.Specify NB-IoT Band.WebHome]]
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