One wet weekend in March 2010, a retired glider pilot spent 16 hours going up and down the M1 motorway in the UK with four mobile phones, four separate sim cards, a laptop and an industrial-sized thermos full of tea. Methodically he’d pull over, make test calls, send texts and try to access the internet on all four phones. He painstakingly recorded the results of his tests in a custom-coded spreadsheet.
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