Failures may not be instantly apparent. This has caused many to abandon a brand and since there are other phone makers, you let them change brands. I have an older LG and never dropped it, but my prior phones were never dropped for simple reasons such as I didn't want to replace my phone as soon as other folk.
So, if you dropped it, even once, all bets are off.
I have a Samsung galaxy s6, and its screen is defective, it started with some vertical lines on the side (green and purple), then a little blob of purple, now it has a black hole and the whole screen is purple. It has fallen a few times but the defects were never caused directly by an impact. So now im scared of buying another samsung phone, because of this. So what should I do? Is this a common thing? Can it easily happen again?
Im contemplating on buying an Iphone, but i dont like IOS for anything. Too restricted for me.

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