Sprint is the latest operator with a pricing plan that targets US visitors to neighbouring countries.

The operator promises “free” unlimited calls and texts for existing subscribers travelling to Mexico, Canada and more than a dozen Latin American countries who opt for its Open World add-on.

The tariff is designed to appeal to users who live along the US-Mexico or US-Canada borders and frequently move between the countries, or those who travel internationally to Canada, Mexico or Latin America on a regular basis.

Open World also includes 1GB of free data per day for visitors to Mexico, Canada and a further twelve Latin American countries. Usage above 1GB per day is charged at $30 per GB.

In addition, the Sprint add-on offers “free” calls and texts to Canada and Mexico from the US. Calls to the Dominican Republic from the US to more than 180 countries start at $0.05 per minute.

Sprint is not alone in targeting cross-border users. Last month its arch rival, T-Mobile US, launched its Mobile Without Borders plan which offers calls, text and 4G data roaming to Mexico and Canada for no extra charge.

And AT&T, which is also now an operator in Mexico, plans to develop what it terms a North American Mobile Service.