Animal models in drug and vaccine testing are used to confirm drug effectiveness, but not conclusively until human studies are done. But, if bad effects are seen, then this is grounds for caution. Not so, apparently, for mobile phones. I am sure that most young people, who are virtually a part of their mobile phones, are more concerned about their phone getting cancer than them. Nevertheless, a recent study found that there was “clear evidence” of malignant tumours in the hearts, brains and adrenal glands of male rats.
https://www.livescience.com/63996-cellphones-cancer-rats-ntp-study.html?utm_source=ls-newsletter&utm_medium=email&utm_campaign=20181103-ls
https://ntp.niehs.nih.gov/results/areas/cellphones/index.html
One science site says that human users should not be unduly concerned: