SURVIVAL -- Although you should never depend on a cell phone to be your ticket safety in an outdoor survival situation, it has obvious benefits  -- if the battery isn't dead, if it works, if you have coverage, etc.

But even if you cell phone was dropped and broken, it still has some remarkable potential as a survival tool, as this interesting Daily Infographic illustration details.

One point about the cool suggestion of using the phone's speaker magnet, a leaf and a piece of wire to make a compass:

This situation assumes there is NO WIND or that you can shelter the leaf from any influence by the wind.