How can I get a specific toll free telephone number?

The toll-free numbers can only be called from certain phone numbers, depending upon the preferences of the customer (and sometimes the provider) who has the phone numbers. The default is that these numbers are available from any phone in Canada or the USA. However, many US toll-free numbers cannot be accessed from Canada, and many Canadian toll-free numbers cannot be accessed from the USA. Some are not accessible from pay phones (from a list known to the provider). Although toll-free numbers are not accessible internationally, many phone services actually call through the USA, and in this case the toll-free numbers become available. Examples of these services are the MCI Worldphone international calling card, and Vonage internet telephone. However, many calling card services charge their own fee when their toll-free numbers are used to make calls, or when their toll-free numbers are used from pay phones.