"There is no evidence non-ionizing radiation is safe" FALSE. You can say "There is no PROOF non-ionizing radiation is safe", and that is trivially true because it is non-provable. But there's plenty of EVIDENCE that' it's safe.
On the other hand, there is also no evidence that non-ionizing radiation at the powers and frequencies in common use is dangerous for human health. Saying "we do not know the long term health impacts" is erring on the side of caution, and, again, is trivially true simply because mobile technology has only seen widespread use in the last 25 years, and many long-term studies are still ongoing. However there still have been some long-term studies (I believe there was one in Scandinavia running for at least 10 years), and none of these have shown any harm.