BGS2T AT Command Set
13.7 AT+CMGS
BGS2T_ATC_V01.301 Page 381 of 554 1/31/12
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• Message Length in Text Mode
The maximum length of a short message depends on the used coding scheme: It is 160 characters if the 7
bit GSM coding scheme is used, and 140 characters according to the 8 bit GSM coding scheme.
In case UCS2 character set selected it is highly recommended to set Data Coding Scheme (<dcs> of
AT+CSMP) to 16-bit data, otherwise the length of sms user data is restricted to 88 octets. Even better for mes-
sages with UCS2 character set is the PDU Mode.
• In general but especially at baudrates below 19200 it is recommended to only use the command line termi-
nation character (ATS3) before starting text or PDU input. Use of line termination character followed by an
additional response formatting character (ATS4) may cause the problem that the latter will become part of the
input data.
• During a pending USSD user interaction the AT+CMGS write command returns "+CME ERROR: operation
temporary not allowed" to prevent blocking situations.
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