Sony’s smartphones have traditionally centered upon three or four key strengths: the OmniBalance design, two-day battery life, high-quality camera sensor, and waterproof rating.

Two of those, design and camera, have now been challenged, even refuted, and now it seems that Sony itself is trying to debunk another one. The Japanese OEM has updated the wording on some of its support pages to warn users not to use their smartphones underwater, despite their top IP68 dust and waterproof rating, conflicting with their own previous marketing campaigns.
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https://www.slashgear.com/sony-now-backtracking-on-phones-underwater-prowess-11404155/