iPhone home buttons are paired with the motherboard they are sold with. Apple made it so that the home button can go completely inactive with minor cracks. "Security reasons". Even when a
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:no_upscale()/cdn.vox-cdn.com/uploads/chorus_asset/file/13712122/akrales_190123_3174_0207.jpg "Apple's now-defunct home button is a reminder that even the best buttons can fail - The Verge")