The Apple Watch 1 was also only water resistant (IPX7), in fact just as resistant to water as the iPhone 7 as the second digit is what refers to waterproofing capabilities, and several members of this forums regularly swam with it with no problem. Also, the Apple Watch 1 was supposed to be able to go in the shower without a problem (Tim Cook himself said he always went to the shower with it) and the iPhone 7 has the same rating, so I highly doubt that it would suffer any harm without even being exposed directly to the water streams.
And although I wouldn't put it under a water stream, but even IP66 (the immediately lower rating) states that: EDIT: As someone stated before IP ratings are not accumulative beyond 6, so immersion protection doesn't necessarily mean presurized water protection.
"Water projected in powerful jets (12.5 mm nozzle) against the enclosure from any direction shall have no harmful effects. Water volume: 100 litres per minute. Pressure: 100 kPa at distance of 3 m. Duration: 1 minute per square foot, from a minimum of 3 minutes."
And IP67 should withstand 30 minutes under 1m of water without any water entering the enclosure.
So shower is probably ok for the iPhone 7. However, let's wait for iFixit to tear it down and we will get a better idea of how well protected it is. With the Apple Watch some independent people tested it in labs under 50+ m water pressures with no problem, so again Apple might just be covering his back as some people will push the "water resistance" very far from its IP67 specification and there's no way to prove in which conditions the iPhone got water-damaged.
TL;DR Shower is perfectly fine, but try to put the iPhone away from water streams.
And although I wouldn't put it under a water stream, but even IP66 (the immediately lower rating) states that: EDIT: As someone stated before IP ratings are not accumulative beyond 6, so immersion protection doesn't necessarily mean presurized water protection.
"Water projected in powerful jets (12.5 mm nozzle) against the enclosure from any direction shall have no harmful effects. Water volume: 100 litres per minute. Pressure: 100 kPa at distance of 3 m. Duration: 1 minute per square foot, from a minimum of 3 minutes."
And IP67 should withstand 30 minutes under 1m of water without any water entering the enclosure.
So shower is probably ok for the iPhone 7. However, let's wait for iFixit to tear it down and we will get a better idea of how well protected it is. With the Apple Watch some independent people tested it in labs under 50+ m water pressures with no problem, so again Apple might just be covering his back as some people will push the "water resistance" very far from its IP67 specification and there's no way to prove in which conditions the iPhone got water-damaged.
TL;DR Shower is perfectly fine, but try to put the iPhone away from water streams.
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