iPhone users have been left amazed by a hidden feature in the Calculator app that allows them to convert currency on the go, without needing an internet connection or third-party apps. TikToker Bianca Montalvo (@biancamontalvo) recently shared a video demonstrating the feature, calling it a game-changer for travellers.

In the viral clip, she explained: “If you’re travelling internationally this next year, you need to know this new iPhone trick to make your trip so much easier.” The…