When I got my first pacemaker more than 20 years ago (I'm now on my third one), my cardiologist told me not to worry about airport security screening or home microwaves. He said there were only four restrictions: (1) For the first two weeks, don't raise your left arm above your head. (2) Never use a jackhammer again. (3) Don't get too close to an electric welder. (4, and most important) Never have an MRI.
My present cardiologist tells me not to put my cell phone in my shirt pocket, but it is okay to wear my medical alert device on a lanyard around my neck (I take it off when I go to bed).
FWIW. Your mileage may vary. Follow your own doctor's orders.
A little anecdote: When I got my first pacemaker, my daughter talked with her then-very-young daughters about what it was and how it worked. One of them asked, "Does that mean Grandpa's heart will never stop beating and he will live forever?" She responded, "No, everyone dies sooner or later, and when he does, they will just turn it off!"
