Weather Channel gives tips on using your cell phone after a Hurricane3
Without power, cell phone users need to stretch out the life of their battery. Texting takes less out of your battery than making a phone call. And while experts suggest keeping your phone on only when it is necessary, when you do have the power on you should make sure that your display is set to the lowest "Brightness" setting. The light on a cell phone screen is the biggest consumer of battery power on most smartphones.
If you do lose service, your carrier is most likely working hard to get things back to normal. Cook adds that Verizon has a fleet of temporary cells that can be used after a Hurricane to get customers back on its network quickly.