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From time to time, the iPhone Home button can become less responsive to clicks, and pressing the button will either result in a delay, lag, or sometimes complete unresponsiveness requiring multiple clicks. While this could be symptomatic of a hardware issue caused by moisture damage or dropping the phone, sometimes you can fix the response problem with the following sequence:
Why this works to fix the buttons responsiveness isn’t entirely clear, because the procedure actually just force quits the application you launched in the first step. This procedure supposedly recalibrates the Home button. Whatever is going on behind the scenes, it does seem to work and definitely has made mine seem to respond quicker.
This should also help the iPad and iPod touch home buttons as well. If you try this and still have problems with the home button being unresponsive, you may just need to get it repaired.
You can sometimes fix an unresponsive Home button by force quitting apps, but that doesn’t always work. If your iOS devices home button is completely broken then you can use an accessibility feature called Assistive Touch to enable a virtual home button instead, this lets you use an iPhone, iPad, or iPod even if the button is physically incapable of being pressed due to damage or whatever else. Here is how to turn this feature on:
This is the only way to continue using an iOS device with a broken home button without repairing the home button itself.
If you’re stuck in an app you can’t get to the home screen because the button is broken, just turn the device off and on again and you’ll boot directly to the home screen where you can then launch Settings.