OH for zero. both my home and work numbers, 555-4230, and 555-3305 (555 is never used for real numbers, it is a reserved exchange in US-- always used in movies, tv, etc.) are Four, two, three, Oh,and three, three, Oh, five.

i hate it when companies give out there number as all letters.. 1-800 MATTRESS-- leave off the last s for savings.. and i have to sit there and translate the whole thing in to numbers..

even as a child i learned FO 5- for Fordham, but almost immediately relearned it as 365-