In reply to davidbeynon:
> It looks as if the issue there is that the pocket itself is waterproof so it filled up and gave the blokes phone a dunking. Mesh would have let the person get damp but probably saved the shiny electronics.
Apart from the sweat that finds its way into the phone (as vapour) and then condenses. That's also a problem when putting electronics in pockets of breathable waterproof jackets; vapour gets through the jacket into the pocket via the lovely breathable fabric. But it's cold in the pocket (being separated from body heat by the jacket fabric), so water condenses either in the pocket, or inside the phone itself (as above).
Really best not to put any electronic devices into
any pockets of waterproof jackets, not even items that have are 'waterproof' (i.e. have high IPxx ratings), as water
vapour may be able to breach even high IPxx protection.