Quarantine surveillance in Taiwan means your phone must be on

A BBC article captures the story of a student living in Taiwan under quarantine, who reports that when his battery on his phone ran out, within an hour four different local administrative units contacted him; and a patrol was dispatched to verify his location; and a text was sent that the government had lost track of him and warned him of potential arrest for breaking quarantine.

According to the BBC report, Taiwan uses mobile signals to triangulate location of people under quarantine (including travellers); regular alerts being sent to authorities if handset is turned off for more than fifteen minutes; and people are contacted up to twice a day to check that they have their mobile at hand.

Source: https://www.bbc.co.uk/news/technology-52017993

Publication: BBC