The last two iPhones I bought were defective. I don't think its widespread, I just think I was unlucky. A 6s had a white line on the display, I was told it was an LCD issue. I exchanged it immediately. The last phone I bought, a 7+, has a broken camera. A family member brought it for me while abroad, and he didn't touch it. He just booted it to see if it worked. Therefore, the camera is still broken. I took it to an Apple Store within days of my warranty ending (my country has no Apple Store. I had to wait until I - or somebody I knew - travelled), and - this really bothered me. They could have made an exception considering my situation - but they refused to exchange it, because, as the warranty was close to ending, they had to check everything was fine with the phone before exchanging it. This would take 10 days. The family member that travelled didn't have 10 days, they told Apple this, and Apple said "Sorry, there's nothing we can do".
The phone is still broken and the warranty is long gone. They should have done something. They knew I had no more time, and while it isn't their fault I live in an awful country, the phone was still in warranty. I don't care for how long. It was still in warranty, and next time I - or someone - travels, I strongly doubt Apple will do anything. They'll probably charge me the OOW fee.