Yes it is possible. You can set 8 bit character coding scheme by
+csmp=,,,245 and then you can write the message as hex characters
using Text mode.
BR
M, Forum Nokia
RE: Send Operator Logo in TEXT mode.
2002-10-09, 08:11#3
AT+CMGF=1
AT+CSMP=65,,0,245
AT+CMGS="1234567"
0B05041582000000030102013021F3540A00480E01FFFFFFFFFFFFFFFFFF000000000000000000FFFFFFFFFFFFFFFFFF00000000000000000010F0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
AT+CMGS="1234567"
0B050415820000000301020200000000000001
BR
M, Forum Nokia