Confusion when living in the states and buying parts from Australia

When calling Aus mobile / cell phones, dial for international access (011) then the country code for Aus (61) and drop the leading zero from the mobile number she gave you, e.g. if number she provided was something like 0412 345 678 then the correct format to dial is 011 61 412 345 678 - hope this helps.
I called a number listed on this site from over a decade ago. A very nice lady answered with a simple "Hello?" She said she would pass along my request and my contact info to Anthony. She also gave me his cell phone #. I attempted to call that number, but my call will not go thru. Hopefully I can purchase from him. Otherwise, I will see about having my existing manifold modified locally.