$10 DIY project can help detect when police are trying to track your phone
androidauthority.com
androidauthority.com
Discussion (172 points, 2 days ago, 17 comments) https://news.ycombinator.com/item?id=43283917
(82 points, 4 days ago, 5 comments) https://news.ycombinator.com/item?id=43258620