The technology has 'become the weapon of choice of stalkers and abusers,' a recent lawsuit against Apple argues Strange chirping sounds and alerts on iPhones have put some Americans on high alert over the last year and a half as they try to figure out why an unknown device is tracking their every move. It’s one of the latest crime trends that tech-savvy criminals are using to carry out car thefts and stalkings, which has pushed police departments across the nation to warn residents to watch out for the new tactic.