for Example 662-5643 becomes 0662-5643 and 913-4567 becomes 0913-4567 and 4740052 becomes 0474-0052, it is the same idea and less complicated, or am I missing something? I know in many countries you dial a zero before a number, and I did a quick google search (didn't read it all) and found these two things
1) Link to a Wired Article from 2003 link
2) This video
Purgatorian Post #0-1305