Some iPhone 7 users report hissing sounds, others raise Home button questions

Now that users have had a couple of days with the iPhone 7, people are starting to get a better idea of how it works, and some have found a couple of unexpected surprises. 

The first one has to do with the most important button on the iPhone 7: the Home button. Instead of a mechanical button that depresses when you push it, the iPhone 7's solid state (non-mechanical) Home button doesn't move and instead operates using software, providing haptic feedback to mimic the feel of a button push. 

But we already knew that before the device went on sale. So what's the potential problem?  Read more...