iPhone 7 hissing issue identified by users

The iPhone 7 is out and Apple's latest has already netted spectacular sales numbers in its opening week.

That's pretty much par for the course and, apart from an iOS 10 blip, the handset has launches with very few problems. Naturally, that can't last.

The latest issue comes from a number of users who are saying that their handsets start to emit a strange hissing noise when they're being used intensively. Here's an example.