[Digital Today AI Reporter] Even smartphones rated IP67 or IP68 can be damaged by steam and heat in a hot shower room, requiring caution. A water-resistance rating does not mean a device is safe in all water and humidity conditions.

Engadget reported on Aug. 26 that a smartphone's IP rating shows how well it withstands liquid water and dust under controlled test conditions. In a hot shower room, high temperature and humidity act at the same time. If steam condenses into droplets around a smartphone, water may enter around the charging port, speakers, buttons and sealing. Repeated exposure to heat and humidity can also gradually reduce the performance of internal adhesives and waterproof seals.

Manufacturers also warn of this. Apple advises users to avoid showering with an iPhone or using it in a sauna or steam room. It says water resistance is not permanent and may diminish with normal use, and liquid damage is not covered under its limited warranty. Google also recommends not taking Pixel phones into a shower room or sauna.

High temperatures themselves can also strain smartphones. The recommended operating temperature for iPhones is 0 to 35 degrees Celsius. If internal temperature rises too much, charging may stop, the screen may dim and a temperature warning may appear. Repeated exposure to high heat can also speed up battery ageing.

If a smartphone gets wet, it is recommended to wipe off surface moisture immediately and not connect a charging cable. It should be left to dry naturally in a well-ventilated place with the charging port facing downward, and external heat sources such as hair dryers should be avoided.

The safest way to use a smartphone is not to rely only on its water-resistance rating and repeatedly expose it to hot and humid shower conditions.