ILEC (incumbent local exchange carrier) An ILEC (incumbent local exchange carrier) is a telephone company in the U.S. that was providing local service when the Telecommunications Act of 1996 was enacted.
To call a US toll free number from Mexico, dial as follows: 800 numbers Dial 001-880-then the number 866 numbers Dial 001-883-then the number 877 numbers Dial 001-882-then the number 888 numbers Dial 001-881-then the number.o call a US toll free number from Mexico, dial as follows: 800 numbers Dial 001-880-then the number 866 numbers Dial 001-883-then the number 877 numbers Dial 001-882-then the number 888 numbers Dial 001-881-then the number.
Area codes begin with any digit except 0. Subscriber numbers can begin with any digit except 0 or 9 (but may begin with 1 in many cases). While Mexico City area code is 55 (i.e. numbers are in form +52 55 xxxxxxxx), some suburbs of Mexico City use area codes in the 59x format (i.e. +52 59x xxxxxxx format). Area code in Mexico is called 'NIR' (Region Identification Number) or Clave Lada.