Sim-swap fraud is on the rise. How can you stop it happening to you?

hen the Twitter account of its own chief executive, Jack Dorsey, was taken over by hackers last year, a stream of tweets with racial slurs, profanity and praise for Adolf Hitler were posted for 30 minutes. Weeks later, the food writer and campaigner Jack Monroe lost £5,000 from bank and payment accounts accessed from a hijacked phone.