d15 Modem Integration and Application Developers Guide version draft 0.53 Page 53 of 181
Figure 33 – Sending data SoftGSM
4.6 Call waiting, call forwarding, and conference calls
These operations are not recommended, as behaviour can be very problematic depending on
network conditions such as roaming or call dropout.
4.7 Sending
SMS
4.7.1 Sending a SMS Message in PDU Mode
AT+CPIN=”nnnn”
Enter PIN which enables SIM card.
AT+CSMS=0
Select message service response; response will be
+CSMS:001,001,001
AT+CPMS=”SM”
Select preferred message storage; response will be
similar to +CPMS:001,0015,001,015 depending on
your SIM card.
AT+CMGS=<length of TPDU><cr>
<SCA><TPDU><ctrl-Z>
<SCA>: Service Center Address, refer to GSM 04.11
<TPDU>: Transport Protocol Data Unit, refer to GSM
03.40
Example:
AT+CMGS=19
>07914483056100F511000B914410927856F40000000541E190F804<0x1A>
Will CMGS:000 after sending “ABCDE” to phone number 44-012-987-654 via the SMS
center at 44-385-016-005. Note this is an example only, this particular SMS center is an UK
number.