There's no evidence that phones cause cancer (nor impotence). It's a reasonable assumption to make, but the evidence doesn't back it up:

> The only consistently recognized biological effect of radiofrequency radiation in humans is heating. The ability of microwave ovens to heat food is one example of this effect of radiofrequency radiation. Radiofrequency exposure from cell phone use does cause heating to the area of the body where a cell phone or other device is held (e.g., the ear and head). However, it is not sufficient to measurably increase body temperature. There are no other clearly established effects on the human body from radiofrequency radiation.

https://www.cancer.gov/about-cancer/causes-prevention/risk/r...