Small business owners and contractors who work outdoors need a waterproof cell phone. Oil and gas drillers, construction and maintenance crews, firefighters and emergency medical technicians cannot predict the weather and even if they could, they cannot choose to stay indoors due to rain, sleet or snow. Most cell phone owner manuals state that exposure to water or moisture is harmful to the cell phone and can invalidate the warranty. Outdoor workers could not work effectively without clothing to protect them from the weather, they should have cell phones with the same protection.