Specifications

Smart Machine Smart Decision
SIM900_AT Commands Manual_V1.07 255 2012.12.10
Once defined, the CID can be
activated.
Activate CID 1, if the CID is
already active, the mobile
returns OK at once. If no
CID is defined the mobile
responds +CME ERROR:
invalid index.
Note: If the mobile is NOT
attached
by AT+CGATT=1 before
activating, the attachment is
automatically done by the
AT+CGACT Command.
AT+CGACT=1,1
AT+CGACT=1,3
OK
+CME ERROR: requested
service option not subscribed.
Use the defined and activated
CID to get online. The mobile
can be connected using the
parameters of appointed CID
or using default parameter
AT+CGDATA="PPP", 1 CONNECT
The mobile supports Layer 2 Protocol (L2P) PPP only.
Note: If the mobile is NOT attached by AT+CGATT=1 and the CID is NOT activated before
connecting, attaching and activating is automatically done by the AT+CGDATA Command.
Some providers require using an APN to establish a GPRS connection. So if user uses the
Microsoft Windows Dial-Up Network and ATD*9… to connect to GPRS, user must provide the
context definition as part of the modem definition (Modem
properties/Connection/Advanced…/Extra settings.) As an alternative, user can define and activate
the context in a terminal program (e.g. Microsoft HyperTerminal) and then use the Dial-Up
Network to send only the ATD Command.
13.9 AT+CNETSCAN Command
AT+CNETSCAN can show all local mobile network service providers’ information if module
power-on without SIM card. Also AT+CNETSCAN can show the information of current network
service provider which module is registered to if module power-on with SIM card.
Here is a sample while module power-on without SIM card.
AT+CNETSCAN
------MOST SUITABLE CELL------
Operator:"CHN-UNICOM",MCC:460,MNC:1,Rxlev:61,Cellid:b5f0,Arfcn:0110
Operator:"CHN-UNICOM",MCC:460,MNC:1,Rxlev:25,Cellid:0e93,Arfcn:0723
Operator:"CHN-UNICOM",MCC:460,MNC:1,Rxlev:16,Cellid:5779,Arfcn:0722
------OTHER SUITABLE CELL------
Operator:"CHINA MOBILE",MCC:460,MNC:0,Rxlev:15,Cellid:f4e2,Arfcn:0016
Operator:"CHINA MOBILE",MCC:460,MNC:0,Rxlev:18,Cellid:f952,Arfcn:0019