After installing the app in your smartphone or tablet, it is required to download the database from internet, so your device requires internet access (the first time only, any additional update is optional). The application´s database contains over 4700 area codes in Mexico, over 11,000 entries for USA and 3500 entries for Canada. Additionally, it covers all countries´ codes in the world.
You also learn how to build the dialling code depending on your current location and the country and city as destination.
The app runs either in english or in spanish.