Symbian unicode character

Qt programs for Symbian not support fully Unicode:
I'm trying to write a Symbian calculator with Qt with a mathematic buttons like ÷ and π :
m_dashSolidus = new QPushButton(QChar(0x00F7));
m_pi = new QPushButton(QChar(0x03C0));

but after compiling and installing program in my phone it not show theses mathematics symbols but it show other symbols like " and ^. (in in emulator S60_3rd_FP2_SDK_v1.1 it show the true characters ÷ and π).

and for arabic characters it show me the false character, for example I like show the ج character but it show me ف in phone .
(in emulator S60_3rd_FP2_SDK_v1.1 it show the true character: ج).
m_fa = new QPushButton(QChar(0x062C));

my phone (Nokia 5730) support fully input/output English/French/Arabic languages.