Technolutionary

tj asked: Preserving battery life: you can turn off cellular data entirely. Also, IIIRC turning off Wi-Fi's "Ask to Join Networks" will help preserve battery life. Same with Settings » Sounds » Vibrate [turn off]. (Also note: Turning off location services will help, but it will also mean that you can't use Google Maps to find your location or use "Find My iPhone".)

TJ’s got a few extra tips for you in the run up to the storm.  You *can* turn off cellular data, but dialing it back to EDGE will give you maximum utility. A text is cheaper on the battery than a phone call.