Medical devices are potentially vulnerable to the electromagnetic fields generated by magnets and radios. A medical study published just this month said, “Once the iPhone was brought close to the ICD over the left chest area, immediate suspension of ICD therapies was noted which persisted for the duration of the test.”
ICD stands for implantable cardioverter defibrillator which is used to monitor heartbeats and to fix them if they’re irregular (eg. life-threatening) with electric shocks.
Citing current research, the US FDA (Food and Drug Administration) maintains that “cell phones do not seem to pose a significant health problem for pacemaker wearers.” But it also advises people to hold their phone to the ear opposite the side of the body where the pacemaker is and to avoid keeping their phone in a pocket near or above the pacemaker.