Unless it is an emergency, it is not advised to make phone calls from your hotel room. An exorbitant hotel phone bill can leave a blemish on even the most pleasant of vacations. A 5 minute phone call can cost you US$25.
Pre-paid phone cards for Mexico
If you are a temporary visitor your best option is to purchase a pre-paid Telmex phone card. Many people have found that US and Canadian calling cards or long distance services do not work from Mexico, but Telmex USA cards are issued by the only telephone company in Mexico, so they will work. The Telmex Traveler Phone Card is the prepaid phone card from Telmex USA that allows you to call from Mexico to the U.S., Canada and the rest of the world at competitive rates. The Telmex Traveler Phone Card works from any touchtone phone by dialing a toll free access number, your PIN and it is supported by bilingual personal assistance 24 hours a day.
Calling Mexico from the United States
To call from the United States to Mexico, one must dial 011-52, the city area code, followed by the seven-digit local Phone number.
To call the number 684-5555 in Mexico from The United States, dial 011(international access code) + 52(Mexico's country code) + (City area code) + 684-5555 (Phone number you are trying to reach).