Hi there. My apologies. I correct myself, Nokia 225 can't have multiple number on one contact.

How to enter multipal contact numbers

its not showing any separate field to add a contact its just showing the existing which will leads to edit the existing the no and enter the new no , It not showing any field to add another no

First, make sure the contact is saved in phone's memory. Choose a contact and open the details. Press Options and choose Add number.

Let me know if that works.