I tried doing this last night. I put a plastic sandwich bag around my phone and poked a hole for my headphones through the bag. It seemed to work for a little while but the screen got very foggy and moist. Then the screen started to change colors. I wouldn't recommend it.
In fact, it's pretty bad for your phone. Most steam rooms are over the temperature limit for the phone, and they are not sealed. You'll end up with humidity trapped inside of your phone that will wreak all kinds of havoc on it.
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you can try but the best answer is no when it is hot the water is still in the air so if you set your phone down water can get in between the cracks in your phone and if you have water in your phone the more likely it will start to break or slowly die without possibilty to charge properly