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Author

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1		-XWiki.Xiaoling
	1	+XWiki.David

Content

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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]]
16	16
17	17
18		-
19	19	(% style="color:blue" %)**2. Network access operation:**
20	20
21		-1) AT+CFUN=0
	20	+(% style="color:#037691" %)**1) AT+CFUN=0**
22	22
23		-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
24	24
25		-3) AT+NRB
	24	+(% style="color:#037691" %)**3) AT+NRB**
26	26
27		-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**
28	28
29	29
30	30	[[image:image-20220530093821-4.png]]
31	31
32	32
33		-
34	34	(% style="color:blue" %)**Remarks:**
35	35
36		-~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.
37	37
38		-2. The network access time varies with the signal strength
	36	+2. The network access time varies with the signal strength.
39	39
40		-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.
	39	+
	40	+
	41	+(% style="color:blue" %)**3. Check the signaling connection status:**
	42	+
	43	+(% style="color:#037691" %)**1) AT+CSCON?**
	44	+
	45	+(% style="color:#037691" %)**Response
	46	++CSCON: <n>,<mode>
	47	+OK**
	48	+
	49	+(% style="color:#037691" %)**<n> Enable/disable the URC.
	50	+0 Disable the URC
	51	+1 Enable URC +CSCON: <mode>
	52	+<mode>Signaling connection status.
	53	+0 Idle
	54	+1 Connected**
	55	+
	56	+
	57	+(% style="color:blue" %)**4. Check the PDP Context Activate/Deactivate**
	58	+
	59	+(% style="color:#037691" %)**1) AT+CGACT?**
	60	+
	61	+(% style="color:#037691" %)**Response
	62	+[+CGACT: <cid>,<state>]**
	63	+
	64	+(% style="color:#037691" %)**[+CGACT: <cid>,<state>]
	65	+[…]
	66	+OK**
	67	+
	68	+(% style="color:#037691" %)**<state> Integer type. The state of PDP context activation.
	69	+0 Deactivated
	70	+1 Activated
	71	+<cid> Integer type. A numeric parameter which specifies a particular PDP context definition (see
	72	+AT+CGDCONT).**(%%)
	73	+
	74	+
	75	+