How to add interstitial ads in old admob?

How to add interstitial ads in old admob? Is it possible or is it only available in the new admob?

Thanks

Unless Admob contacted you and granted you access, I believe it’s only possible with the new Admob.

I am still on old admob (mainly because google says new admob not available yet for my location).

I am continuing to use Admob House Ads (banner ads) as before. And just recently added Admob Interstitials as an option to my apps - which seems to be working. Revenue is slightly higher than Leadbolt HTML AppWall (as Leadbolt also has risen somewhat in revenue last couple of days).

(1) You create an ad unit
(2) In your code, you request an interstitial ad using the ID of the unit created in (1)
(3) The End.