How to use Cellphone/Smartphone in Mexico?
Cellular providers offer supplemental services and plans to enable customers to bring their cell phones in foreign countries. Other options include using local SIM cards to make calls while traveling or residing in another country. Some basic guidelines and tips will help you effectively use a cell phone and smartphone abroad to save money.
1. Contact your cell phone provider to activate international calling, rent an international cell phone or purchase an unlocked phone and SIM card for use in another country.
2. Check the voltage requirements for the desired country and bring a power converter for the phone charger, if necessary.
3. Type frequently used telephone, emergency contact, hotel and transportation numbers on the phone and save them in the phone's address book. Make sure to enter the telephone numbers using the international dialing format: for example, calls to the U.S. should be entered with the prefix "+011" followed by the area code and telephone number because calls made abroad will initiate from the local phone carrier.
4. Turn off the function for "Automatic" checking of emails, if you're using a smartphone such as a BlackBerry or iPhone. Instead, change the email settings to "Manual" to reduce data roaming charges. During your trip you can choose when to check for email messages when you're connected to a free, wireless Internet connection, such as in a hotel lobby or Internet cafe.
5. Consider signing up for Skype and activating a Skype to Go number or downloading and installing the Skype mobile application for smartphones. A Skype to Go number is a local number that serves as a gateway to call outside the country to save money on roaming charges and providing a number for calls to be forwarded to your cell phone. The Skype Mobile application uses the smartphone's data plan or wireless Internet connection for calls to Skype members or other telephone numbers.
References: USA Today Travel Tips