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| 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 | ((( | ||
| 6 | Below is the definition for the (% style="color:blue" %)**AT+CSQ** | ||
| 7 | ))) | ||
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| 9 | [[image:image-20220530094441-1.png]] | ||
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| 11 | CSQ Definition | ||
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| 15 | (% style="color:red" %)**In this case, you can check:** | ||
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| 17 | * Whether the antenna connection is good. | ||
| 18 | * Whether you use a valid SIM Card | ||
| 19 | * Whether you the SIM card place correctly. | ||
| 20 | * Whether the NB-IoT Network you use match the End Device Module support network. | ||
| 21 | * 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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