In a collaborative effort, Apple and Google have developed an industry-standard detection feature called “Detecting Unwanted Location Trackers” (DULT) for Bluetooth trackers. This standard allows users on iOS and Android devices to be alerted if an unknown Bluetooth tracker is monitoring their location.
They were so close on the acronym: “Detecting Unwanted Location Trackers” should be “Detecting Ominous Location Trackers” (DOLT). (“Obnoxious” also works but unfairly downplays the stalking/domestic-violence angle.)