Gizmodo UK has pulled together some fascinating data summarising what Transport for London learned from tracking peoples' phone on the Tube late last year:

At the end of last year, between 21st November and 19th December, Transport for London carried out an intriguing trial: It was going to track your phone on the London Underground.

Today, thanks to the Freedom of Information Act, Gizmodo UK can exclusively reveal some of the utterly fascinating findings that the agency has been able to make from all of our data - and how the plan, if the trial is deemed a success and tracking is implemented full time, is also to use the data to inform advertising decisions on the Tube network. […]

Good work.

[Via @chrisapplegate]