How can I display a private number after call. Any special code for it?

If there was, then why would people have private numbers? Think about it!

Scott is right, there is no way to find out who belongs to the private numbers; however, there is a code you can use to block private numbers from calling your line.
If they want to get through to your phone line, they have to allow their number to be shown.
You can call your local phone company to find out the code for this.