你普及的知识有点过时了，电磁辐射被世界卫生组织定义为潜在治癌物的

针对你这两句：

从致癌的角度讲，只有紫外线（太阳光中就有）及波长更短的X光，和gamma射线有引起癌变的风险。他们是电离辐射。

无线电波，微波（手机，无线电话， 核磁共振）， 可见光都是非电离辐射（能量低），不会引起癌症。

看这里：
Overall, extremely low frequency magnetic fields were evaluated as possibly carcinogenic to humans (Group 2B), based on the statistical association of higher level residential ELF magnetic fields and increased risk for childhood leukaemia. Static magnetic fields and static and extremely low frequency electric fields could not be classified as to carcinogenicity to humans (Group 3).

出处：http://iopscience.iop.org/0952-4746/21/3/604