Passport control and visas are a necessary security feature for international travel, but in the future it could be done away with.
An initiative introduced by the World Economic Forum (WEF) called the Known Traveller Digital Identity (KTDI) programme is already in a pilot phase.
The WEF website confirms that the scheme: "allows people to fly document-free between international destinations".
"Testing for the scheme is underway, and passengers enrolled in the pilot project will be able to travel between Canada and the Netherlands using their mobile phone instead of a passport," says the WEF.
What does this mean