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so i took my iphone 8 plus into the shower and it was fine. then i took it out and blew it out with canned air. while i did that i was holding the screen. i felt the screen bulge out as if it where filling with air. i am very worried that i may have broken the speakers or the waterproof seal.

Gday Pigg, the iPhone 8 isn’t waterproof to begin with, Its only IP67. Using canned air on a wet phone could actually force liquid in, especially if it had enough pressure to inflate the phone. Air should escape/enter the phone easier than liquid. I would avoid taking your phone in the shower… use that 10 mins for yourself. All the best mate.