If a phone can survive thirty minutes at the bottom of a pool, a shower should be nothing. That logic is why so many people prop their phone on the soap shelf. It is also why repair shops see so many "water-resistant" phones with moisture inside.
Why a shower is harder than a dunk
- Steam. This is the main problem. Water resistance relies on seals and fine membranes that block liquid water. Water vapour is a gas, and gas passes through gaps that droplets cannot. Once inside, the steam cools and condenses back into water on the circuit board, behind the camera lens and under the screen.
- Heat. The seals are adhesive strips. Repeated heating and cooling makes them soften, shrink and lose their grip over time.
- Soap and shampoo. These lower the surface tension of water, which is exactly what they are designed to do. Low surface tension lets water creep through meshes and seals that would normally stop it.
- Pressure. The IP test uses still water. A shower head produces a moving jet that can force water past a seal.
Apple's guidance says not to expose an iPhone to pressurised or high-velocity water, such as when showering, and not to use it in a sauna or steam room. Samsung gives similar advice.
What usually goes wrong
- Fog inside the camera lens. Often the first sign. See fog inside a phone camera.
- Muffled speakers. Soap film dries on the mesh and blocks it more stubbornly than plain water does.
- "Liquid detected" warnings when you try to charge afterwards.
- Slow damage. One shower will rarely kill a phone. A daily habit wears the seals down until an ordinary splash gets in.
If your phone has already been in the shower
- Wipe it dry, including around the camera and buttons.
- If it had soap or shampoo on it, wipe it with a cloth dampened with clean water, then dry it again.
- Leave it outside the bathroom. The room stays humid for a long time after a shower.
- Run the water eject sound to clear the speakers.
- Wait until the charging port is dry before plugging in.
Safer ways to have music in the bathroom
- Leave the phone outside the door and turn the volume up. Simple, and it works.
- Use a waterproof Bluetooth speaker. A speaker rated IPX7 is built for this and costs far less than a phone repair.
- Keep the phone on a dry shelf away from the spray, and run the extractor fan or open a window. This reduces the steam, though it does not remove it.
- Use a sealed pouch if you must have the phone in reach. See waterproof phone pouches.
The honest answer
A modern water-resistant phone will survive a shower. It will not survive a few hundred of them in the same condition it started. Since liquid damage is not covered by standard warranties, the bathroom shelf is an expensive place to keep a phone.