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...	...	@@ -7,7 +7,7 @@
7	7
8	8	1) AT+CEREG=5
9	9
10		-2) AT+CEREG?  ~/~/This process may be longer, please repeat the input
	10	+2) AT+CEREG?  ~/~/  This process may be longer, please repeat the input
11	11
12	12	3) Mainly check the two parameters cause_type and reject_case
13	13
...	...	@@ -15,12 +15,11 @@
15	15	[[image:image-20220530093747-3.png]]
16	16
17	17
18		-
19	19	(% style="color:blue" %)**2. Network access operation:**
20	20
21	21	1) AT+CFUN=0
22	22
23		-2) AT+NBAND=X  ~/~/X means the local frequency band number
	22	+2) AT+NBAND=X  ~/~/  X means the local frequency band number
24	24
25	25	3) AT+NRB
26	26
...	...	@@ -30,7 +30,6 @@
30	30	[[image:image-20220530093821-4.png]]
31	31
32	32
33		-
34	34	(% style="color:blue" %)**Remarks:**
35	35
36	36	~1. The operating voltage of the SIM card used must be less than 3.0V