If you plan on living or doing business in Mexico, you will be calling cellular phone users.
I’ve listed examples of how to correctly dial in order to reach a cellular telephone in Mexico. There are 3 scenarios; local calls, domestic Mexican long distance and international long distance.
Let’s assume you want to call a cellular telephone in Leon, Guanajuato and the cellular phone number is 123-4567.
Example #1: Local call. If you are in Leon, Guanajuato and are calling a cellular phone number in Leon, you would dial from any phone:
044-477-123-4567
The 044 is the local access code for local cellular numbers.
The 477 is the area code of Leon, Guanajuato.
The 123-4567 is the telephone number.
Example #2: Domestic Mexican long distance. Calling a Leon cellular phone number from another city in Mexico. In this case you would dial
New dialing code Nov. 4, 2006 045-477-123-4567
Where 045 is the Mexico domestic long distance access number for cell phones.
477 is the area code for Leon.
123-4567 is the telephone number.
Example 3#: International long distance. If you are calling from the USA to a Mexican cellular phone in Leon, Guanajuato. You would dial;
New dialing rule Nov. 4, 2006 011-52-1-477-123-4567
011 is the international access code.
52 is the country code for Mexico.
1 is the cellular phone code.
477 is the area code of Leon.
123-4567 is the telephone number.
Remember that area codes for Mexico City (55), Guadalajara (33) and Monterrey (81) are 2 digits, followed by the telephone number that has 8 digits. All other cities have a 3 digit area code and 7 digit telephone number.
Related Links
Changes for dialing long distance to cellular phones in Mexico
Tip: How to call Mexico from the US
Lee Iwan Accumulated Experience 
Thanks – it worked!! 10/17/2009
David
i will add this to my stumble account
do you have the new codes ? i wonder