then the ME/TA converts the entered text into GSM alphabet,
according to 3GPP TS 27.005 Annex A.
- if current <dcs> (see +CSMP) indicates that 8-bit or UCS2 data
coding scheme is used and current <fo> (see +CSMP) indicates
that 3GPP TS 23.040 TP-User-DataHeader-Indication is set, then
the entered text should consist of two IRA character long
hexadecimal numbers which ME/TA converts into 8-bit octet
(e.g. the asterisk will be entered as 2A (IRA 50 and IRA 65) and
this will be converted to an octet with integer value 0x2A).
To avoid malfunctions it is suggested to wait for the #CMGS: <mr> or +CMS
ERROR: <err> response before issuing further commands.
The command maximum length is 560 including the AT command itself. For
example: AT#CMGS="1234567","SMS text" the length is 28.