For many of the world’s most powerful people, standard smartphones sold by household brands like Apple and Samsung are no longer enough.

With sensitive data, critical contacts and other information usually being carried around in their pockets daily, security concerns are fueling the rise of a new industry providing ultra-secure smartphones which can cost millions of dollars to buy and use.

Politicians, executives and underworld bosses are increasingly starting to turn to this secretive industry developing ultra-secure smartphones which they hope will keep them safe from hackers – and often from the police as well.

Earlier this week, it emerged that Jeff Bezos, the boss of Amazon and the world's richest man, was allegedly hacked via a phone belonging to Saudi Arabia's crown prince Mohammed bin Salman.

Many adopting these new, more secure smartphones may argue that Bezos could have avoided any sort of security breach had he not used an iPhone X.

To use these secure devices, clients often need to pay monthly fees stretching into the thousands to keep their software running.

The cost of devices sold by Communitake, an Israeli business, can reportedly rise to millions of dollars. It may seem like an exorbitant charge, but it’s a drop in the ocean for its client list which is said to include politicians and UN officials.