How to retrieving IMEI &IMSI no using j2me?

Retrieving IMEI:

I am trying to get IMEI on phone using following properties

nokia:

System.getProperty("com.nokia.mid.imei");
System.getProperty("phone.imei");
System.getProperty("com.nokia.IMEI");

But most of the nokia phones simply show the null values but I get IMEI from SonyEricsson phones using Sony properties

SonyEricsson:
System.getProperty("com.sonyericsson.imei" );

How to retrieve the IMEI no in nokia phones??

Retrieving IMSI:

I didn’t get the IMSI Number from any phones is there any way in J2me or phones having any properties like this????