Your iPhone has a small sensor at the end of the headphone jack, you can see it with a bit of effort if you shine a good torch down there.
If the sensor is red then your iPhone is water damaged and will not be replaced.
If the sensor is white then your iPhone isn't water damaged and will be replaced on the spot (no repairs for iPhones, just replacements).
If the sensor is red and you glue a small disc of white paper on top of it and it resists the pressured air that the Apple folk will spray down there to try and dislodge it then you get a replacement.
Your iPhone has a small sensor at the end of the headphone jack, you can see it with a bit of effort if you shine a good torch down there.
If the sensor is red then your iPhone is water damaged and will not be replaced.
If the sensor is white then your iPhone isn't water damaged and will be replaced on the spot (no repairs for iPhones, just replacements).
If the sensor is red and you glue a small disc of white paper on top of it and it resists the pressured air that the Apple folk will spray down there to try and dislodge it then you get a replacement.