I have read that the ISM band is the same in most countries around the
world. A person asked me why this was the case and I wasn't sure. My
guess is that since devices using this unlicensed spectrum are often
mobile devices or in mobile vehicles (e.g., planes, cars, etc.), a
device could seriously interrupt communications when going from one
country to another if the ISM standards were not the same. Is this
somewhat correct?

Thanks,

Kensei