Did you double blind test it, with other people putting both working and dummy DECT phones next to your head in a way that you couldn’t tell which is which? That is where the idea of electrosensitivity fails every time.
If you had followed the link you would have found out that GCSEs are roughly the equivalent of a Mittlere Reife or a high school diploma. They are nothing special. Unless you are in the learning disabilities group at a British school you will have learned about how waves work in nature.
