From the manufacturer’s use guidelines and warranty periods. They tell you to keep the phone away from dust and liquids (good luck with that in your pockets) and the warranty on Z Fold series is 2 years in the EU and 1 year worldwide. I’m yet to see one make it past 4 years with no screen defects throughout, i.e. there are currently very few users of Fold4 who haven’t had the screen replaced. Then again the average phone lifespan worldwide is 3 years (which sounds crazy to me, I used my last daily phone for 6 and would keep doing it if I didn’t want to install Linux on it), so I suppose it checks out.
Where did you get this info?
From the manufacturer’s use guidelines and warranty periods. They tell you to keep the phone away from dust and liquids (good luck with that in your pockets) and the warranty on Z Fold series is 2 years in the EU and 1 year worldwide. I’m yet to see one make it past 4 years with no screen defects throughout, i.e. there are currently very few users of Fold4 who haven’t had the screen replaced. Then again the average phone lifespan worldwide is 3 years (which sounds crazy to me, I used my last daily phone for 6 and would keep doing it if I didn’t want to install Linux on it), so I suppose it checks out.
iPhone Duo is IP68 for dust and liquid, rare among foldables. As I understand it only one of the Pixel foldables is rated the same.