Ifixit and HealthyStuff did a chemical analysis on 36 phones to find the amount of chemical toxins. They took apart the phones and used X-ray fluorescence spectrometry to find the chemical composition of each phone. Phones released after 2010 proved to be much healthier on the scale such as the Iphone 5 and Samsung Evergreen. While older phones such as the Iphone 2G and Palm m125 were some of the worse overall ratings. Even though a lot of phones scored average on the overall does not mean they did good on specific tests such as the Samsung Reclaim having a high proportion of arsenic even though it scored low on the other tests.