Doesn't Taiwan use something similar? Except that, if memory serves, they don't require an app to be installed they just require the network operator to geo-fe

Doesn't Taiwan use something similar? Except that, if memory serves, they don't require an app to be installed they just require the network operator to geo-fence the mobile phone and notify the user if they stray from home and the authorities if the user doesn't return home after being reminded. Seems unnecessary to use an app when the network can triangulate pretty well in densely populated areas.