Good article. Again, no documentation that the device was definitively proven to be the actual cause of
a problem. Even then, none of those problems actually resulted in an "incident" jeopardizing life or safety. There were cases that they were the SUSPECTED cause, based on some cursory tests by flight crew at the time of occurrence, but subsequent testing by trained technicians were unable to duplicate the problem. In some cases the device MAY have been a contributing factor, but not necessarily the specific cause of the anomaly. Regarding the situation of cellphones affecting ILS, the report concludes that the chance of that actually happening is one in one million, or POTENTIALLY once every two years in normal U.S. flight operations. Besides, all commercial aircraft systems have some kind of redundancy. A failure or inaccuracy of the ILS system is backed up by something, greatly reducing the likelihood of a crash due to that one issue. Being involved with various airfield operations over the years (twenty three years in USAF Communications), I have seen various ILS failures occur during landings. None of them resulted in a crash.