Amateur radio frequencies are the same the world over. Through repeaters stretched across the world, ham operators are able to relay messages of health and welfare to countless numbers of people. During the recent hurricanes I've heard numbers of up to 800 + operators volunteering their time to work at American Red Cross shelters and other places, making calls to reassure family members far away that their loved ones are okay!
When telephones don't work, emergency depts. can't communicate with each other, and chaos reins, Amateur Radio Operators step in and fill a big gap in communications. They are the silent groups behind the scenes. Let us not forget the good that these volunteers do.
78's, KD5KTY New Mexico