这是我在SIEMENS AT COMMAND SET里面摘录的一段：
AT+CPMS Preferred SMS message storage
Revision according to GSM 07.05 Version 4.7.0
Test command
AT+CPMS=?
Response
+CPMS: (list of supported <mem1>s),( list of supported <mem2>s) ,(list
+of
supported <mem3>s)
Parameter
<mem1>
Memory from which messages are read and deleted
SM SIM message storage
ME Mobile Equipment message storage
MT combination of "ME" and "SM" storages
<mem2> Messages will be written and sent to this memory storage:
SM SIM message storage
ME Mobile Equipment message storage
MT combination of "ME" and "SM" storages
<mem3> Memory in which received messages are preferred to be stored, if
routing to TE is not set (see AT+CNMI command with parameter
<mt>=2)
SM SIM message storage
ME Mobile Equipment message storage
MT combination of "ME" and "SM" storages
Read command
AT+CPMS?
Response
+CPMS:
<mem1>,<used1>,<total1>,<mem2>,<used2>,<total2>,<mem3>,<used3>,<total3
>
Parameter
<memx>
Memory from which messages are read and deleted
<usedx> Number of messages currently in <memx>
<totalx> Total number of messages that can be stored in <memx>
Write command
AT+CPMS= <mem1>[,<mem2>[,<mem3>]]
Parameter
<mem1>
See Test command
<mem2> See Test command
<mem3> See Test command
+CPMS: <used1>,<total1>,<used2>,<total2>,<used3>,<total3>
OK/ERROR/+CMS ERROR
Notes 1) The Mobil Equipment storage "ME" has capacity for 25 short messages
2) The storage "MT" is a combination of "ME" and "SM" storage. If "MT" is
chosen indices < 26 refer to ME" storage while indices 26 or higher are
associated with the "SM" storage
3) Incoming short messages with message class 2 (see GSM 03.38) will be
stored in the "SM" storage only. Therefore, the AT^SMGO:2 indication (see
AT^SMGO command) can occur without a preceding AT^SMGO:1 indication.
一些概念：
MEM1：读取和删除短信所在的内存空间。
MEM2：写入短信和发送短信所在的内存空间。
MEM3：接收到的短信的储存位置。
具体用法：
1、语句：
AT+CPMS=?
作用：
测试命令。用于得到手机所支持的储存位置的列表。在我的SIEMENS M55手机上返回：
AT+CPMS=?
+CPMS: ("MT","SM","ME"),("MT","SM","ME"),("MT","SM","ME")
表示手机支持MT(手机终端),SM(SIM卡),ME(手机设备)
2、语句：
AT+CPMS=”MT”,”ME”,”SIM”
设置MEM1为MT，MEM2为ME，MEM3为SIM
3、语句：
AT+CPMS?
作用：
得到当前的设置。
例如通过第二条语句的设置以后返回：
AT+CPMS?
+CPMS: "MT",7,150,"ME",7,100,"SM",0,50
表示MT里面有7条短信，总共可以储存150条。ME里面有7条，共可以储存150条。SIM卡上可以储存50条。
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