quick question, does sony cover cracked screens? because i dropped my phone and the screen has a small crack but the touchscreen is completely not working now, its still under warranty so will they cover this normally? also, if not , how much does it cost to fix and will it lose its waterproofing if i replace it myself?? been looking on their site but they make it so awkward to find any useful info
Take it to a Sony store /centre if there's one you can get to and see what they say. It can totally depend on the person you see and the individual centre. If they feel bad for you they might do it, plus Z3 is "old" now so they will be looking (I expect) to get rid of the parts if they have a surplus so it's down to luck.
Don't act like you're willing to pay for it yourself as they get to bill Sony Warranty if it's covered anyway. Sony's market share is meh, so the last thing they need is more unhappy customers and losing repeat sales.
Then if its a serious no, and that's after a lot of fighting (if you're brave making a big fuss can break them ;p) then ask how much. Probably will be extortionate so if you can follow a guide to replace it yourself this will be better.
Water resistance is temperamental at best on these phones so you will likely lose it by replacing yourself, but how often do you really need it? Phones were fine before water proofing so it's just a niche feature not a necessity. Plus there are loads of people saying they lost their's after using warranty anyway.
Mine had the screen replaced for dead pixels (and they actually did a full refurbishment ports and all) in Russia (bought phone there as was cheap) and the pressure test for water proofing still works, but I haven't tested it since and don't really want to get it wet on purpose. So again depends on the service centre.
Hope my essay helps. Could all be useless. Just my experience with Sony
