sorry, but that information is incorrect and will result in a fast busy signal for most numbers
there are very few companies that have 800 forwarding systems that will take a mexican phone call and refer it to the united states, mostly companies such as airlines…
otherwise, according to the current telmex phone book, there are several conversions that can be made in order to call an american or canadian toll free number from mexico.
please note that these calls are no longer toll free, but at least you can get through to who you are trying to reach.
to call an 800 number, change the 800 to 880
to call an 888 number, change the 888 to 881
to call an 877 number, change the 877 to 882
to call an 866 number, change the 866 to 883
example: in order to dial “Adams Ant Company” in Toledo, Ohio, at 1-800-555-5565, you would need to dial 01-880-555-5565 (note the use of the mexican long distance code of “01”, not the mexican international access code of “001”)