BERLIN: Airdrop on iPhones and Quick Share on Android phones are useful features for wirelessly exchanging photos, videos, and documents between devices.

However, these very features have been abused in recent years in a process known as cyberflashing - when someone sends obscene unsolicited photos or videos to your phone.

To digitally protect yourself in public spaces, you'll need to choose more restrictive settings. If you don't want to send or receive files at all, it's best to turn these features off completely.