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Giving our glorious and enlightened authorities the benefit of the doubt for the moment, mobile operators already collect many metrics on cell hand-offs and transit times etc. Sharing just this data, on volumes of movement, could help with a view as to how well the - effectively - voluntary lockdown is operating and how it is changing over time-of-day and day-of-week and could also act as an alert if the behaviour starts drifting as the population starts getting bored and complacent and then if further measure, especially in certain geographies, are required.