Specifications

SIM900 AT Command Manual
SIM900_AT Command Manual_V1.03 105 12/24/2010
2 "STO UNSENT" Stored unsent messages
3 "STO SENT" Stored sent messages
<toda> GSM 04.11 TP-Destination-Address Type-of-Address octet
in integer format (when first character of <da> is + (IRA 43)
default is 145, otherwise default is 129)
<tooa> GSM 04.11 TP-Originating-Address Type-of-Address octet
in integer format (default refer<toda>)
<tosca> GSM 04.11 RP SC address Type-of-Address octet in integer
format (default refer <toda>)
<vp> depending on SMS-SUBMIT <fo> setting: GSM 03.40
TP-Validity-Period either in integer format (default 167) or in
time-string format (refer <dt>)
Reference
GSM 07.05
Note
4.2.5 AT+CMGS Send SMS Message
AT+CMGS Send SMS Message
Test Command
AT+CMGS=?
Response
OK
Parameters
<da> GSM 03.40 TP-Destination-Address Address-Value field in
string format(string should be included in quotation marks);
BCD numbers (or GSM default alphabet characters) are
converted to characters of the currently selected TE character
set (specified by +CSCS in TS 07.07); type of address given
by <toda>
<toda> GSM 04.11 TP-Destination-Address Type-of-Address octet
in integer format (when first character of <da> is + (IRA 43)
default is 145, otherwise default is 129)
<length> integer type value (not exceed 160 bytes) indicating in the
text mode (+CMGF=1) the length of the message body
<data> (or <cdata>) in characters; or in PDU mode
(+CMGF=0), the length of the actual TP data unit in octets
(i.e. the RP layer SMSC address octets are not counted in the
length)
Write Command
1) If text mode
(+CMGF=1):
+CMGS=<da>[,
<toda>]<CR>
text is entered
<ctrl-Z/ESC>
ESC quits without
sending
2) If PDU mode
(+CMGF=0):
+CMGS=<length
><CR>
PDU is given
<ctrl-Z/ESC>
Response
TA sends message from a TE to the network (SMS-SUBMIT). Message
reference value <mr> is returned to the TE on successful message delivery.
Optionally (when +CSMS <service> value is 1 and network supports)
<scts> is returned. Values can be used to identify message upon unsolicited
delivery status report result code.
1) If text mode(+CMGF=1) and sending successful:
+CMGS: <mr>