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.
Step 1. Dial 001, which is the international dial code to call the United States, when you have a dial tone. Step 2. Dial 880 if your toll-free number begins with 800. Dial 881 for an 888 number.Dial 882 for an 877 number and dial 883 for all 866 numbers. These codes only apply to calls from Mexico.Step 3. Dial the main seven-digit telephone number normally and wait for the call to connect.tep 2. Dial 880 if your toll-free number begins with 800. Dial 881 for an 888 number. Dial 882 for an 877 number and dial 883 for all 866 numbers. These codes only apply to calls from Mexico.