"The phones caused detectable interference in 20 percent of the cases and produced symptoms such as heart palpitations, light-headedness or dizziness about 7 percent of the time...The doctors said the interference sparked potentially serious problems with the pacemaker in 6.6 percent of the tests."
"Technology is rapidly changing as the Federal Communications Commission (FCC) is making new frequencies available. Newer cellphones using these new frequencies might make pacemakers less reliable. A group of cellphone companies is studying that possibility. "