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Author

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1		-XWiki.Xiaoling
	1	+XWiki.David

Content

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9	9
10	10	(% style="color:#037691" %)**2) AT+CEREG?**  (%%) ~/~/  This process may be longer, please repeat the input
11	11
12		-(% style="color:#037691" %)**3) Mainly check the two parameters (% style="color:red" %)cause_type and (% style="color:red" %)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]]
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17	17
18	18	(% style="color:blue" %)**2. Network access operation:**
19	19
20		-(% style="color:#037691" %)1) AT+CFUN=0
	20	+(% style="color:#037691" %)**1) AT+CFUN=0**
21	21
22		-(% style="color:#037691" %)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		-(% style="color:#037691" %)3) AT+NRB
	24	+(% style="color:#037691" %)**3) AT+NRB**
25	25
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
	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]]
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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.
	39	+
	40	+
	41	+(% style="color:blue" %)**3. Check the PS Attach or Detach  **
	42	+
	43	+(% style="color:#037691" %)**1) AT+CGATT?**
	44	+
	45	+(% style="color:#037691" %)**Response
	46	++CGATT: <state>
	47	+OK**
	48	+
	49	+(% style="color:#037691" %)**Write Command
	50	+AT+CGATT=<state>**
	51	+
	52	+(% style="color:#037691" %)**<state> Integer type. Indicates the state of PS attachment.
	53	+0 Detached
	54	+1 Attached**(%%)
	55	+
	56	+
	57	+**Note:Generally, when registering with an operator, attaching GPRS is automatic, and CGATT can manually attach the network.**
	58	+
	59	+
	60	+(% style="color:blue" %)**4. Check the signaling connection status:**
	61	+
	62	+(% style="color:#037691" %)**1) AT+CSCON?**
	63	+
	64	+(% style="color:#037691" %)**Response
	65	++CSCON: <n>,<mode>
	66	+OK**
	67	+
	68	+(% style="color:#037691" %)**<n> Enable/disable the URC.
	69	+0 Disable the URC
	70	+1 Enable URC +CSCON: <mode>
	71	+<mode>Signaling connection status.
	72	+0 Idle
	73	+1 Connected**
	74	+
	75	+
	76	+(% style="color:blue" %)**5. Check the PDP Context Activate/Deactivate**
	77	+
	78	+(% style="color:#037691" %)**1) AT+CGACT?**
	79	+
	80	+(% style="color:#037691" %)**Response
	81	+[+CGACT: <cid>,<state>]**
	82	+
	83	+(% style="color:#037691" %)**[+CGACT: <cid>,<state>]
	84	+[…]
	85	+OK**
	86	+
	87	+(% style="color:#037691" %)**<state> Integer type. The state of PDP context activation.
	88	+0 Deactivated
	89	+1 Activated
	90	+<cid> Integer type. A numeric parameter which specifies a particular PDP context definition (see
	91	+AT+CGDCONT).**(%%)
	92	+
	93	+
	94	+**Note:Note that having a cell ID attached to the network does not necessarily mean successful activation. For data exchange, such as initiating HTTP requests, activation is necessary to use them.**