I sent AT+COPS=1 (manual operator selection) to set the operator and got an OK response.
Then I sent AT+COPS? and got the following response:
+ COPS: 0
Is it “auto operator selection” even though I specified “manual operator selection”?
It seems that this response occurs when the set operator is not available.
The document says the following:
TA forces an attempt to select and register the GSM/UMTS
network operator. If the selected operator is not available, no
other operator shall be selected (except <mode>=4). The
format of selected operator name shall apply to further Read
Command (AT+COPS?)
If there are no operators available, no operator should be selected, so why is the mode set to 0?
What does this mean?