At present, there is no specific offence of ‘cyber-flashing’ but this behaviour can potentially fall within the offences of harassment or public nuisance. If you receive an obscene picture from a stranger in this way, whilst you are travelling on the rail network, take a screenshot of the photo and report the incident to the British Transport Police.
This will stop your device receiving AirDrop requests.
In order to prevent yourself from becoming a victim of cyber-flashing over AirDrop, you can turn Airdrop off on your iPhone when you are not using it:
1 Go to Settings > General > AirDrop
2 Choose the option – Receiving Off