Verizon's user forum had a nice short list of tips for earthquake victums that would work for any disaster scenario where you had to bug out of your home.

1. Know how to use call forwarding at home. If you have to evacuate, forward your home phone calls to your cell phone.
2. Conserve battery power and free-up wireless networks for emergency response agencies by limiting non-emergency calls.
3. Keep a car-charger in your vehicle in case you must evacuate.
4. Save emergency phone numbers in your cell phone for one-touch dialing.
5. Store back-up batteries for electronic devices, including your cell phone.
6. Consider using text messages to communicate.
7. Understand your cell phone’s capabilities: e-mail, weather updates and news reports are all tools that can help after a disaster.