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Why in the world would you need phone data for that???
Nearly all existing public transportation was designed before cell phones. And there's so many better ways to get that data... In fact, I'm not sure anyone uses individually identifiable tracking to plan public transportation... It's neither necessary or even convenient for that
https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/662948/utilising-mobile-network-data.pdf
74 page document about mobile phone data and transportation modeling.
Origin destination data from cell phones is useful for fairly obvious reasons.