Note: Reserved bits are ignored.
Example:
AT+CPMS?
+CPMS: "SM",13,50,"SM",13,50,"SM",13,50
OK
AT+CMGR=1
+CMS ERROR: invalid index
AT+CMGR=142
+CMGR: "STO SENT","054565034",
message text
OK
AT+CSDH=1
OK
AT+CMGR=142
+CMGR: "STO SENT","054565034",,129,25,0,0,"05/04/03,21 : 22: 23+08","+
97254120032",145,<message length>
message text
OK
AT+CMGW=18
> 079179521201009511000c917952428650290004AA0441424344
+CMGW: 143
OK
AT+CMGR=143
+CMGR: 2,,23
0791795212010095040C917952428650290004502032110201800441424344