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[0] - Unless you want to take a risk and get someone to replace you just the broken glass, a process which involves some manual fumbling with heatguns and UV-hardened glues. Or, unless you live in Shenzhen, where they'll replace you the whole phone front (with electronics and all) for cheap, if you give them your phone front (which they presumably fix up later and resell to the next person).
I dropped my Xperia Z1 Compact a bunch of times from that height, the screen is still fine...
> You accidentally sit on it, and you may have a screen to replace.
Solution: Don't ever put your phone in your back pocket.
I used the occasion to ask for a front for S3. She sold me one for somewhere around $50 - because I didn't have the broken one for exchange - which I later used to fix my SO's phone myself. It's not that hard after you've seen how the Chinese do it, though a little stressful - I had to use a needle to punch through a speaker canal, which for some reason wasn't hollowed out properly :).
I guess the reason it works in Shenzhen is because that's the place where the phones are made and recycled - they have tons and tons of parts for every model imaginable, both from factories and from broken phones. Given how many different phone models are out there, I doubt any city except a major metropolis could sustain this type of market.
We are very far away from phones that you could use without screen protection and not see damages after 1-2 years. For a device that is supposed to be carried around all the time, modern phones show little resistance against scratches. But maybe that's just not possible to archive.