A VoIP toll free is a number assigned to companies or used by businesses and start with three digit numbers i.e 8 followed by 00 or 88 and so on. They are called toll free because there is no charge for callers. The cost is paid by the individual/company - owner of the number.
Often corporate and medium sized firms subscribe to these type of numbers. However, with the advancement of IP based communication, almost anyone can have a VoIP toll free nowadays.
VoIP Toll Free Numbers
Here are the most common toll free codes that start with 800, 844, 855, 866, 877 and 888. The '1-800' is one of the first number introduced in 1996.