The main difference between 1300 numbers and 1800 numbers is one has a 3 and one has an 8...just kidding.
The real difference between 1800 numbers and 1300 numbers is the charge to the caller who calls an 1800 number or a 1300 number.
1800 numbers are classified as Toll-Free numbers because the caller pays nothing to call a 1-800 number. 1300 numbers are classified a Local-Call numbers because they attract a single, one-time payment to make a call to anywhere in Australia. This means 1300 numbers are not free to call but the good news is that most reputable mobile plan Providers include free calls to 1300 numbers.