Xiaomi Mi 5s Plus devices allow attackers to trigger touchscreen anomalies via a radio signal between 198 kHz and 203 kHz, as demonstrated by a transmitter and antenna hidden just beneath the surface of a coffee-shop table, aka Ghost Touch.
https://medium.com/%40juliodellaflora/ghost-touch-on-xiaomi-mi5s-plus-707998308607
https://hackercombat.com/nfc-vulnerability-may-promote-ghost-screen-taps/