I have an iPhone 6s and I am thinking of getting a Lifeproof Fre case for it and have a few questions. 1. Do I need to have the mute switch toggled on or off on my iPhone when I put this case on as I've heard many people have had issues with the mute switch. 2. Does this protect against steam or very humid places? 3. The website says it is snowproof, but Apple says to not use the phone in less than 32 degree temperature, so does this case protect against extreme cold too?