The test command returns supported indicator states.
Response syntax:
+CIND: (<descr>,(list of supported <ind>s))[,(<descr>,(list of supported <ind>s))[,...]]
The test command parameters and their defined values are the following:
Other values are <descr>-specific.
The following command example reads the indicator states:
AT+CIND=?
+CIND: ("service",(0,1)),("roam",(0,1)),("message",(0,1))
OK