Most modern smartphones carry IP67 or IP68 ratings, but those numbers only describe resistance to liquid water under specific conditions—not to the hot, humid air of a shower. As Engadget reports, steam can condense back into liquid on and inside the device, and the combination of heat and moisture gradually breaks down the adhesives and seals that keep water out. That means a phone that survives a brief dunk may still suffer long-term damage from regular bathroom use.
The business implications are straightforward: liquid damage is typically not covered under warranty, even if the phone is rated water-resistant. Apple and Google both advise against exposing devices to saunas and steam rooms, and they note that such exposure can void coverage. For consumers, the cost of a replacement or repair often exceeds the price of a simple Bluetooth speaker, which can handle the humidity and is far more expendable.
Heat is another factor. Most phones have a maximum operating temperature around 95°F, and prolonged exposure to hot steam can cause thermal shutdowns and accelerate battery aging. The damage is rarely obvious right away—users might see intermittent liquid warnings or need to use a magnetic charger while the port dries, but internal components are already degrading. The practical takeaway for anyone who wants to protect their investment: keep the phone out of the bathroom entirely, and rely on a speaker for shower audio.