this SIM5218 AT command manual - Cooking Hacks

SIM5218 Serial AT Command Set
Integer type; value in the range of location numbers supported by the associated memory and start
with zero.
Destination-Address, Address-Value field in string format; BCD numbers (or GSM 7 bit default
alphabet characters) are converted to characters of the currently selected TE character set, type of
address given by .
Message Reference
GSM 03.40 TP-Message-Reference in integer format.
TP-Destination-Address, Type-of-Address octet in integer format. (when first character of is +
(IRA 43) default is 145, otherwise default is 129). The range of value is from 128 to 255.
NOTE In text mode, the maximum length of an SMS depends on the used coding scheme: It is 160
characters if the 7 bit GSM coding scheme is used.
Examples
AT+CMSS=3
+CMSS: 0
OK
AT+CMSS=3,"13012345678"
+CMSS: 55
OK
6.14 AT+CMGW Write message to memory
Description
The command is used to store message (either SMS-DELIVER or SMS-SUBMIT) to memory
storage .
SIM PIN References
YES 3GPP TS 27.005
Syntax
Test Command
AT+CMGW=
Write Command
If text mode(AT+CMGF=1):
AT+CMGW=/[,