--the big microwave oven in the sky--

The context suggests that 2G, 3G, 4G, 5G, and WiFi are considered not to be safe regarding harmful biological effects of RF radiation. However, this is a contested view, with differing opinions and conflicting studies cited.

The document suggests possible health risks from exposure to electromagnetic fields (EMF), including acoustic neuroma and malignant brain tumors. The document also indicates the potential for cancer risks, though the assessment of these risks is debated.

https://pmc.ncbi.nlm.nih.gov/articles/PMC7405337/