Some people will not always be tied in to a communication device should an emergency arise. Methods are needed to cover these circumstances. Some activities will not allow access to communication devices. Some ideas:
1. Bring back the emergency siren type methods the CD used during the cold war.
2. Add some sort of visual signals in addition to audio signals. This would also aid those with hearing impairments.
3. Have home security systems like ADT's find a way to relay alerts through their systems.
4. Add short wave, CB, and ham radio methods of alerts.