IMEI number is returned a zero in wk09baseline

I have tried retrieving the IMEI number using the follwoing code.

QtMobility::QSystemDeviceInfo deviceInfo;
QString imeiString;
imeiString = deviceInfo.imei();

I get zero as the response.The same is reproduced on device also.

The issue is reprocude on symbian wk 09 SDK and the same is working fine on WK 06 SDK.