Cellphones need to exude a small quantity of electromagnetic radiation. If you have read Cell Phones Work, then you definitely are aware that cell phones emit signals by means of radio waves, which can be included of radio-frequency (RF) energy, a form of electromagnetic radiation. There is a great deal of talk from the news these days regarding whether cell phones emit enough radiation to cause negative health outcomes. The concern is that cellular phones are often set close to or against the mind during use, which sets rays at contact with the tissue in the head. There's evidence supporting both sides of the argument. https://www.globenewswire.com/news-release/2020/12/30/2151461/0/en/smartdot-reviews-best-emf-solution-for-your-cell-phone-product-review-by-rick-finn.html