Arial Narrow displaying as Arial in iphone

Hi,

I have defined font style like

div#header

{

font-family: 'Arial Narrow',Arial,sans-serif;

}

I have not used any @font-face or any .ttf, .eot etc type of font files.

This is working fine in windows desktop and even in macbook but when I check the same in iphone the font is appearing as 'Arial' instead of appearing as 'Arial Narrow'.

Please let me know what am I missing here.

Thanks