International voice transmission & text messaging
Shortwave technology is one of the best methods to get access to global voice communications. If no other communication lines persist, you can even reach any point of the world from a local shortwave station (depending on weather conditions). This is a quick and very easy way to carry out some information to people in other countries (eg. urgently needed drugs in a disaster).
Shortwaves even give you the opportunity to build communication bridges between two points in the same country. This technology can be used as a stationary setup as well as in the field with transportable equipment.