AT+CSCA? "Operator center of SMS"

Why your component don't try to request the nº of the Operator Center of SMS ???
If i start your example without CSCA, when i try to send the AT command:
AT+CSCA?
reply:
AT+CSCA=""
OK

where is the CSCA number ???

Feature or bug

It's a feature, not bug :-)

Yes, if there is no SCA number then this command is useless. Question is if is worth reading current SCA or do not send AT+CSCA anyway.