In Text mode the +CMGS command has the following syntax:
AT+CMGS=<da>[,<toda>]
After command line is terminated with <CR>, the module responds
sending a four-character sequence prompt:
<CR><LF><greater_than><space> (IRA 13, 10, 62, 32)
After this prompt, you can enter text that should be formatted as
follows:
5. if current <dcs> (see +CSMP) indicates that GSM03.38
default alphabet is used and current <fo> (see +CSMP)
indicates that 3GPP TS 23.040 TP-User-Data-Header-
Indication is not set, then ME/TA converts the entered text
into GSM alphabet, according to 3GPP TS 27.005, Annex A;
backspace can be used to delete last character and
carriage returns can be used; after every <CR> entered by
the user the sequence <CR><LF><greater_than><space> is
sent to the TE.
6. if current <dcs> (see +CSMP) indicates that 8-bit or UCS2
data coding scheme is used or current <fo> (see +CSMP)
indicates that 3GPP TS 23.040 TP-User-Data-Header-