If you used the tube this morning, it's highly likely that TfL used your Wi-Fi connection to find out information about your journey. The data collection initiative is part of a four-week trial which TfL hopes will ultimately improve our experience of the London Underground.
But don't panic, the data will be anonymous, doesn't include web-browsing data and is only being used to trace patterns in commuters journeys at specific times. And none of the data will be passed onto third parties, either. The idea is that TfL will be able to provide better-targeted information to passengers and even figure out which stations are in need of investment.
The only way to opt out of the scheme is to turn off your Wi-Fi, but then how will you get your Facebook fix on your morning commute?
The trial is active across 54 stations, listed here, within zones 1-4 and starts on Nov 21 2016.
Photo: ©Wendy Dobing/ Flickr