Fake notifications are becoming rampant and affecting iPhone or iPad users with the classic tech support scam. The purpose of these fake pop ups is to trick people into calling for assistance by making them believe something bad happened to their device. These pop ups work a lot better on mobile devices than on desktop computers because they are harder to get rid of and seem to be persistent, no matter what. The most important thing to remember is to never call the toll free number for the purported tech support”]
Source: https://blog.malwarebytes.com/threat-analysis/2015/07/defeating-the-fake-ios-crash-reports/