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Chapter 9 – Short Messages Commands
Multi-Tech Systems, Inc. Wireless GSM/GPRS AT Commands (Document Number S000293I) 63
Preferred Message Storage +CPMS
Description: This command allows the message storage area to be selected (for reading, writing, etc).
Values: <mem1>: Memory used to list, read and delete messages. It can be:
SM SMS message storage in SIM (default)
ME SMS message storage in Flash
BM CBM message storage (in volatile memory).
SR Status Report message storage (in SIM if the EF-SMR file exists, otherwise in the ME non
volatile memory)
Note: SR ME non-volatile memory is cleared when another SIM card is inserted. It is kept,
even after a reset, while the same SIM card is used.
<mem2>: Memory used to write and send messages
SM SMS message storage in SIM (default)
ME SMS message storage in Flash
<mem3>: Memory to which received SMS are preferred to be stored
SM SMS message storage in SIM (default)
ME SMS message storage in Flash
If the command is correct, the following message indication is sent:
+CPMS: <used1>,<total1>,<used2>,<total2>,<used3>,<total3>
When <mem1> is selected, all following +CMGL, +CMGR and +CMGD commands are related to the
type of SMS stored in this memory.
The maximum number of SMS is Flash is 99.
When the modem is switched on, <mem1>,<mem2>, and <mem3> are initialized to SM.
Syntax: Command Syntax: AT+CPMS=<mem1>,[<mem2>],[<mem3>]
Command Possible responses
AT+CPMS=?
Note: Possible message storages
+CPMS: ((“SM”,”ME”,”BM”,”SR”),(“SM”,”ME”),(“SM”,”ME”))
OK
Note: Read, list, delete: SMS or SMS Status Report
Write, send: SMS
AT+CPMS?
Note: Read
+CPMS: “SM”,3, 10,”SM”,3,10,”SM”,3,10
OK
Note: Read, write…SMS from/to SIM
3 SMS are stored in SIM. 10 is the total memory available in SIM
AT+CPMS= “SM”,”ME”,“SM”
Note: Select SM for reading, ME
for writing and SM for storing
+CPMS: 3,10,3,99,3,10
OK
AT+CPMS=”AM”
Note: Select false message storage
+CMS ERROR: 302
AT+CPMS=”BM”
Note: Select CBM message storage
+CPMS: 2,20,3,10
OK
Note: Read, list, delete CBM from RAM 2 CBM are stored in RAM
AT+CPMS?
Note: Read
+CPMS: “SM”,3,10,”ME”,3,99,“SM”,3,10,
OK
Note: Read, store...SMS from/to flash, write SMS to flash. 3SMS
are stored in flash. 99 is the total memory available in flash
CMTI: “SM”,4
AT+CPMS= “ME”,”ME”,“ME”
Note: Select ME for reading, ME
for writing and ME for storing
+CPMS: 3,99,3,99,3,99
OK
AT+CPMS?
Note: Read
+CPMS: “ME”,3,99,”ME”,3,99,”ME”,3,99
OK
Note: Read, write, store SMS from/to flash. 3 SMS are stored in
flash. 99 is the total memory available in flash
CMTI: “ME”,4
Note: Receive an SMS stored in flash at location 4
AT+CPMS= “AM”
Note: Select wrong message
storage
+CMS ERROR: 302