Seems to be the big-endian UTF-16 representation as plain hex: 

#!/usr/bin/perl

use Encode;

# Perl char string (UTF-8) - i.e. your input
# (this is the Russian word - literal UTF-8 chars wouldn't be displaye
+d
#  correctly in PerlMonks <code> blocks - thus here as \x{....} )
my $str = "\x{0442}\x{0435}\x{0441}\x{0442}";  

my $utf16 = encode("UTF-16be", $str);

my $sms = unpack "H*", $utf16;

print "$sms\n";   # "0442043504410442"

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In reply to Re: UTF8 to UTF16, but... by almut
in thread UTF8 to UTF16, but... by natol44

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