Ever since Rutherford Hayes installed the first White House telephone in 1877, a call from the president of the USA has not been something to be taken lightly.

Eric Trump, President Trump’s son who is running The Trump Organization, said the new venture called Trump Mobile will sell phones that will be built in the U.S., and the phone service will maintain a call center in the country as well.

Experts have cast doubt on the Trump Organization's claim that its proposed smartphone can be entirely manufactured in the US. One industry analyst told the BBC it would be "virtually impossible" for the gold-coloured handset - which will retail at $499 (£367.50) - to be built in the United States.