I am talking about an OS crash log. All operating systems (should) log this in order to tell you what happened.bthis isn't the crash log that is anonymously sent, but something the OS logs and keeps on your device until that information is needed. In theory, Apple should be able to plug it into their diagnostic machine (when you take it to the Apple Store) and see what, if anything, went wrong. I know for a fact cellular radios are logged in this manner. I had a phone dropping calls, took it incl, they confirmed the system logged a dozen dropped calls (that day alone) and they swapped it out.