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So you're asking for proof that a device that is made of solid glass and metal is more fragile when dropped than the same device surrounded by rubber, plastic, leather or another soft material?

I know it won't protect the device in every situation, but the $10 case protects the device in some situations (maybe only 10% or 20% of drops), so it has a very high ROI.

I once dropped my unprotected iPad from a height of about 2 feet, it landed on the granite floor on a corner edge, and the screen shattered. I had to buy a new iPad basically as Apple doesn't fix them. It now has a $20 case, and I would be willing to bet the value of the iPad that if I dropped it from the same height and it hit the same corner, the device would not have any significant damage although the case might.

> So you're asking for proof that a device that is made of solid glass and metal is more fragile when dropped than the same device surrounded by rubber, plastic, leather or another soft material?

That is distinctly not what I'm asking for. I specifically said "I don't doubt that cases reinforce phones" to address this. What I'm saying is that at any point no person could possible know whether their case has just saved their phone, or whether the phone would have been just as fine without the case.

> I know it won't protect the device in every situation, but the $10 case protects the device in some situations (maybe only 10% or 20% of drops), so it has a very high ROI.

My point is that I think most people don't actually get that ROI. I've had an iPhone for three years. I've dropped my phone. No case. The phone is fine. If you use a case and never drop your phone in such a way that you would have broken it (which is impossible to know, but I'm arguing is an overstated risk), then the price you've paid is a bulkier, heavier, uglier phone. The case comes with a cost other than just $10. If I could pay $10 to have my phone magically become invincible, I would do it. If I could pay $10 for a case, I would not.

I'm sorry to hear your iPad broke. I should say that I'm specifically talking about phones, mostly because the cost of having a case on my iPad all the time would be lower for me than with a phone, which you have to stick in a pocket all the time and thus suffers more from added bulkiness.

Another argument in that direction: I think that, all else being equal, bulkier phones get dropped more from pockets. For example, if my iPod Touch were half a centimeter taller, wider and deeper, it might not be possible to put it in a trouser pocket horizontally. Hence, it might not even be possible to put it deep inside the pocket when I am seated. Both make it easier to fall out of my pocket.

It kind of works like seatbelts. You can't prove that the fact someone fastened seatbelts had saved one from death in the accident that already happened. Some people survive, some people die. But the relative proportion of those two cases is the matter of scientific studies - that's the first method we have to determine that seatbelts help save lives. Another one is a mix of physics and common sense. It's better not to be ejected from your seat at high velocity and fly through glass. In the same way, it's better when the screen does not hit the ground (as rubber cases are bigger than the phone and thus protect from impact) or hits, but with much smaller velocity (as rubber absorbs the energy from collision with the ground).

So yes, we can't say much from all the anecdotes here. But there are strong reasons to suspect that phone cases are a net win in protecting screens from damage.

> But the relative proportion of those two cases is the matter of scientific studies

I guess my point is that I'd like to see a study like this, and I'd like people to stop saying "My case has saved my phone so many times," because nobody really knows that.

I'd like to know how much and in what situations a case actually is likely to save your phone from meaningful damage. Because, to use the analogy, my phone's been in a bunch of car accidents without its seatbelts -- non-trivial ones -- and is completely fine.

It would be one thing if a case didn't come with the added cost of a bulkier phone (as you mentioned, rubber cases make the phone fatter). But they do, so it's a cost-benefit analysis, and I think we're all mostly guessing. My assertion is just that I think most people are guessing too much on the side in favor of having a case, because iPhones are not as fragile as they seem as long as you treat them with a reasonable amount of care.

> iPhones are not as fragile as they seem as long as you treat them with a reasonable amount of care.

Accidents aren't about reasonable amounts of care. Cases are obviously there to protect phones when placed in non-ideal situations. Your crusade against cases is fairly silly.

Well, I replaced the screen on my phone twice before I bought a case. I've dropped my phone many times, both before and after I got the case, but with the case it doesn't seem to get damaged. I got the slimmest case I could find, so it's definitely not bulletproof, but it makes a difference. I'd guess I've saved myself one screen replacement so far. It's maybe 1.5 mm thick, just a touch higher than the volume buttons on my 4S, so it doesn't add much bulk.

This anecdote not the double-blind replicated clinical trial that HN seems to insist on as a rational basis for believing anything, but it's enough to convince me to keep using the case. There's such a thing as being too skeptical.

I agree and can give the opposite example. I have a Sony Ericsson X10 since it was released (2 years ago? Longer?), never had a case, and have dropped it several times. You will find the marks from those falls only if you will look really hard.

It's not that bizarre. It's just an incidental psychological effect of the sunk cost fallacy. "I paid for this, so it must have been worth it, so if a scenario happens in which that-which-I-paid-for could have occurred, it must have occurred."

I use screen protectors because when I get tired of looking at my scratched screen, I can replace the protector and magically have a brand new screen.