https://www.washingtonpost.com/news/the-switch/wp/2018/06/01/signs-of-sophisticated-cell-phone-spying-found-near-white-house-say-u-s-officials/

«Experts in surveillance technology say that IMSI catchers — sometimes known by one popular brand name, StingRay — are a standard part of the tool kit for many foreign intelligence services, including for such geopolitical rivals as Russia and China.»