I found this paragraph in the link below which I thought was very interesting and I hadn't come across this information before.

"Only thirty seconds on a Cell Phone are enough to open up our blood-brain-barrier, a natural barrier that protects our brain from toxins, for eight hours. A Swedish study showed that ninety percent of the women who used a copper-T I.U.D. as their birth control method, while simultaneously using Cell Phone s, developed uterine cancer; the cause being that the I.U.D. functioned as a transmitter and receiver of unnatural, dissonant vibrations."

http://www.meaningoflife.i12.com/shop-himalayan-crystal-salt-vs-table-salt.htm