What the hell is a survival cell phone?
A survival cell phone is one that will survive environmental abuse such as being dropped on the ground from a considerable height, dunked in water and works reliably in extreme temperatures down to -20C and up to +60C where other ordinary cells phone do not work.
You expect flashlights and GPS equipment to be water resistant or waterproof and work over extended temperature ranges (Mil spec??) , why not your cell phone?