It was tested on multiple iPhones running the latest iOS 10.1 updates, and beta copies of iOS 10.2. All test phones were locked up shortly after playing the video. A link to the video, delivered via iMessage, will make iOS 10 play the file in the default player. It appears that the video is corrupt, generating a loop that causes the iPhone to crash around 10 seconds after watching it. Be wary of any links to MP4 files that you receive from friends trying to prank you. Blancco, the global leader in mobile device diagnostic and business intelligence, says the failure rate of Apple iOS worldwide has gone up to 62%, and Apple iOS is tagged as the worst performing mobile OS in Q3 2016, but nothing is proved on such reports.