You may have noticed that some Phone Words are longer than others.

The minimum number of digits required after dialing the 1300 / 1800 prefix is six. However most Phone Words are longer than six letters, and these ‘extra letters’ or digits are called Overdial. Phone Words with the ’13’ prefix have 4 letters after the prefix.

1300 FLOWERS
1800 REVERSE
13 MIDAS
1300 FLOWERS
1800 REVERSE
13 MIDAS

The maximum number of digits after dialing a 1300 / 1800 prefix is 10. The maximum number of digits after dialing a 13 prefix is 5.

Additional letters dialed are treated as ‘dead’ numbers and are ignored by the phone system, not affecting the call in any way.

In general, overdialing simply helps to make phone numbers easier to remember.