Nokia 30 GSM Connectivity Terminal At Command Manual page 107

12. Text mode is enabled: sending/storing of too long a message is attempted, or the
+CSMP does not contain a valid SMS-SUBMIT (in the case of +CMGS=), or the
ME/TA detects that the PDU is of invalid format
13. SMS memory is full
14. <index> given in the +CMSS does not contain SMS-SUBMIT or SMS-COMMAND, or
<index> given in the +CMSS contains SMS-COMMAND and the <da> is given
16. No network service
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