Specifications
SIM900 AT Command Manual       
SIM900_AT Command Manual_V1.03  111  12/24/2010 
4.2.9 AT+CPMS Preferred SMS Message Storage 
AT+CPMS Preferred SMS Message Storage 
Response 
+CPMS: (list of supported <mem1>s),(list of supported <mem2>s),(list of 
supported <mem3>s) 
OK 
Test Command 
AT+CPMS=? 
Parameters 
See Write Command 
Response 
+CPMS: <mem1>,<used1>,<total1>,<mem2>,<used2>,<total2>, 
<mem3>,<used3>,<total3>  
OK 
ERROR 
Read Command 
AT+CPMS? 
Parameters 
See Write Command 
Response 
TA selects memory storages <mem1>, <mem2> and <mem3> to be used for 
reading, writing, etc. 
+CPMS: <used1>,<total1>,<used2>,<total2>,<used3>,<total3> 
OK 
ERROR 
Write Command 
AT+CPMS= 
<mem1> 
[,<mem2> 
[,<mem3>]] 
Parameters 
<mem1>  Messages to be read and deleted from this memory storage 
 "SM" SIM message storage 
<mem2>  Messages will be written and sent to this memory storage 
 "SM" SIM message storage 
<mem3>  Received messages will be placed in this memory storage if 
routing to PC is not set ("+CNMI") 
 "SM" SIM message storage  
<usedx>   integer type; Number of messages currently in <memx> 
<totalx>  integer type; Number of messages storable in <memx> 
Reference 
GSM 07.05   
Note 
4.2.10 AT+CRES Restore SMS Settings 
AT+CRES Restore SMS Settings 










