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...	...	@@ -5,11 +5,11 @@
5	5
6	6	(% style="color:blue" %)**1. Check the reason why you can't access the network:**
7	7
8		-1) AT+CEREG=5
	8	+(% style="color:#037691" %)**1) AT+CEREG=5**
9	9
10		-2) AT+CEREG?  ~/~/  This process may be longer, please repeat the input
	10	+(% style="color:#037691" %)**2) AT+CEREG?**  (%%) ~/~/  This process may be longer, please repeat the input
11	11
12		-3) Mainly check the two parameters cause_type and reject_case
	12	+(% style="color:#037691" %)**3) Mainly check the two parameters **(% style="color:red" %)**cause_type and reject_case**
13	13
14	14
15	15	[[image:image-20220530093747-3.png]]
...	...	@@ -17,13 +17,13 @@
17	17
18	18	(% style="color:blue" %)**2. Network access operation:**
19	19
20		-1) AT+CFUN=0
	20	+(% style="color:#037691" %)**1) AT+CFUN=0**
21	21
22		-2) AT+NBAND=X  ~/~/  X means the local frequency band number
	22	+(% style="color:#037691" %)**2) AT+NBAND=X**  (%%) ~/~/  X means the local frequency band number
23	23
24		-3) AT+NRB
	24	+(% style="color:#037691" %)**3) AT+NRB**
25	25
26		-4) After waiting for a period of time, you can use AT+CSQ to query the network access
	26	+(% style="color:#037691" %)**4) After waiting for a period of time, you can use **(% style="color:red" %)**AT+CSQ **(%%)**to query the network access**
27	27
28	28
29	29	[[image:image-20220530093821-4.png]]
...	...	@@ -31,8 +31,8 @@
31	31
32	32	(% style="color:blue" %)**Remarks:**
33	33
34		-~1. The operating voltage of the SIM card used must be less than 3.0V
	34	+~1. The operating voltage of the SIM card used must be less than 3.0V.
35	35
36		-2. The network access time varies with the signal strength
	36	+2. The network access time varies with the signal strength.
37	37
38		-3. If you have not been able to access the network, please try to access the network manually
	38	+3. If you have not been able to access the network, please try to access the network manually.