Here are the smartphones the expose you to the least amount of radiation. No surprise that Samsung continues to be some of the lowest SAR scores. Also not surprising that Chinese OEM phones have some of the highest. iPhones also continue to have some of the highest radiation exposure to the user. Most experts consider a safe SAR score to be anywhere from .10 to .50. First up, smartphones that scored the best with the lowest exposure to radiation. And now the smartphone who exposed users to the most radiation.