I Want To Change My Number But Can I Transfer My Credit To My Other Sim?

Im with o2

Can I transfer the credit from one sim card to the other?

if so how?I Want To Change My Number But Can I Transfer My Credit To My Other Sim?
i would not do that if i where u. other people might start calling u. because i had that done before and i did not like it. so becareful what u r doing ok friend, j-d.