Both 1300 numbers and 1800 numbers are described as inbound services hosted on an inbound network. Other networks include outbound, mobile, satellite, Voip etc.
Both 1300 numbers and 1800 numbers are described as Virtual Inbound Numbers because they 'piggy-back' other network services such as landline, mobile, Voip, Voice2Email, Fax2Email, Live Answer etc.
Why make your customers pay 35c to call a 1300 number when all calls to a 1800 number are free?
Smart business owners understand the consumer resistance to paying 35c (or more) to call a 1300 number and quickly choose a true "Toll-Free" 1800 number for the same price as a 1300 number. A bit of no-brainer don't you think?.