Specific characters are not displayed

Hi I'm encountering the following problem:
Although I managed to display Greek characters in my wap application some characters are displayed
as a square followed by ?.Can you help me.I can't figure out what the problem might be.
Thanks in advance.

If the display is using a java GUI (I dont know much about WAP apps), you can determine what characters are supported by a font using 'Font.canDisplayUpTo (String)'. For example:
Font font = somethingToGetYourFont ();
String charlist="\u0391\u0392\u0393..."; // Greek character set as unicode escapes
int index = font.canDisplayUpTo (charlist);
if (index==-1)
    // can display all characters in the string
else
    // fails on character #index
}

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