evidence: 5G judged safe by scientists but faces tougher radiation rules 5G phones are to be subject to tougher radiation limits. [...] "Twenty years of research should reassure people there are no established health risks from their mobile devices or 5G antennas," said its chief regulatory officer John Giusti. A number of campaign groups have been lobbying for even tighter rules, claiming that the higher frequencies used for 5G are dangerous.