Block sending of number

[olivechicago]

On my old HD2, there was a neat feature where I could prevent my number from being seen on callerid of the number I was calling was not in my contacts/phonebook.

It seems like stock, my Nexus S does not support this feature. Is there an app out there that accomplishes this?

 

[ifp]

Prefixing the number with *67 should do the trick.