Specifications

SIM900 AT Command Manual
SIM900_AT Command Manual_V1.03 141 12/24/2010
See Write Command
Response
+CSDT: <mode>
OK
Read Command
AT+CSDT?
Parameter
See Write Command
Response
OK
ERROR
Write Command
AT+CSDT=<mo
de>
Parameter
<mode>
0 switch off detecting SIM card
1 switch on detecting SIM card
Reference Note
It is not supported temporarily.
6.2.30 AT+CMGDA Delete All SMS
AT+CMGDA Delete All SMS
Response:
+CMGDA: (list of supported <type>s)
OK
+CMS ERROR: <err>
Test Command
AT+CMGDA=?
Parameter
See Write Command
Response:
OK
ERROR
+CMS ERROR: <err>
Write Command
AT+CMGDA=<t
ype>
Parameter
<type>
1) If text mode:
"DEL READ" delete all read messages
"DEL UNREAD" delete all unread messages
"DEL SENT" delete all sent SMS
"DEL UNSENT" delete all unsent SMS
"DEL INBOX" delete all received SMS
"DEL ALL" delete all SMS
2) If PDU mode:
1 delete all read messages