Apple is thinking of making major changes in its supply chain and has asked its major suppliers to analyse the costs that would be involved in moving between 15% and 30% of production from China to countries like India, Vietnam, Mexico, Indonesia and Malaysia.

Israeli firm Cellebrite, widely believed to be the company that helped the FBI gain access to the iPhone of a terrorist in 2016 after Apple refused to bow to the crime agency's demands, has advertised its latest wares as being able to break into systems running iOS 12.3 and also recent Android phones.

Apple's iPhone has endured the toughest quarter for five years, with its market share in Europe in the first quarter of 2019 falling to 23%, the research firm IDC says.