The latest prank sweeping the globe is tricking Apple users into making a very serious phone call.
Social media posts are encouraging iPhone owners to say "Hey Siri, 108" to the phone's voice command program.
The problem? This automatically makes your phone call 911.
108 is the emergency number in India, and as CNET explains, Apple makes it easy for people to call emergency services from anywhere in the world.
As such, saying any country's emergency number will connect you to the emergency services for where you are – so saying "108" to Siri will actually mean the phone dials "911."
Users are then given five seconds to cancel the call, Mic reports.
Sheriff's offices around the country have been issuing warnings to residents to not fall for the prank, saying it could tie up the lines for those who genuinely do need emergency care.
The Marshall Police Department in Wisconsin is among those warning smartphone owners, pointing out that prank calls to 911 can be considered a crime.
Around 240 million phone calls every year are made to 911, according to the National Emergency Number Association. More than 70 percent of these calls come from mobile devices.