The new "Crash Detection Mode" feature on iPhones caused chaos at Bonnaroo music festival in Tennessee. The feature automatically sends an alert to emergency services if it detects that the user has been involved in a crash, resulting in multiple accidental calls to 911. Police in Manchester advised attendees to deactivate the feature until the conclusion of the event. Fortunately, no crashes were reported during the four-day festival. This is not the first time the feature has caused unintentional 911 calls, as there were similar reports from ski mountains earlier this year.