Re: "after being dropped multiple times on a hard surface"
I had the graphics card on a four year old iMac repaired gratis at an Apple Store because apparently this component had a higher than expected failure rate. So Apple do sometimes do the right thing.
Also worth mentioning that iFixit sound dubious about Apple's explanation that dropping the phone is responsible:
Finally, for anyone in the UK who is affected, you might have a claim for a free fix/replacement under the Consumer Rights Act (replacing the Sale of Goods Act) if your phone fails and you are sure you haven't dropped it. This is in addition to your warranty and requires that Apple shipped an item that was fit for purpose and of satisfactory quality. This extends for up to six years after purchase (five in Scotland) but it obviously becomes increasingly hard to prove an intrinsic defect as the item gets older.