I think you are encoding the <da>
address argument to AT+CMGS
incorrectly.
You refer to 91 and 92 style, but are you actually referring to the '81'/'82' format as explained in the Coding of Alpha fields in the SIM for UCS2 blog post about encoding as specified in 3GPP TS 11.11?
After you run AT+CSCS="UCS2"
every single string must be encoded that way, so for instance to switch from UCS2 to UTF-8 would be AT+CSCS="005500540046002D0038"
.
Alpha fields with 80/81/82 encoding only applies to some cases, and not UCS2 encoded strings in general. In particular notice that the encoding of the string "UTF-8" in the above AT+CSCS
command has nothing to do with this. That also applies to the <da>
argument to AT+CMGS
.
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