More than 67,000 mobile phones will be stolen or lost during the Olympics, according to new research.
Security firm Venafi calculated that the Games represented the riskiest time to be a phone user in London's history.
They said that with an extra million people in the Tube and the total population of the city ballooning by a third, an additional 17,000 mobiles would be lost.
That's equivalent to about 214 terabytes of data.
The calculation was based on a 20,000 mobiles being lost or stolen in the UK each day.
Venafi warned that the impact of a lost phone can be worse than ever, now most are connected to email accounts, App Stores and other potentially costly services. The rise of 'bring your own device' policies at work also heightened the risk.
"There’s been an explosion of corporate data available to users from their mobile devices. This is a real danger and one that is often overlooked,” said Gregory Webb, Venafi Vice President of Marketing. “People don’t consider or take action to protect the vast volumes of information they carry and have internet access to."