Diagnostics
Did you know there’s an app you can open from your Safari browser? Well, there are two, actually, and one of them is the Diagnostics app.
To open this all, all you need to do is go to Safari and enter diags:// or diagnostics:// in the URL and tap on Go. Your iPhone will ask you if you want to open the Diagnostics app, and you need to tap on Open.
And what does this app do? If you don’t have a ticket number from Apple’s tech support team, you pretty much can’t do anything with it. So, hopefully, you’ll never have to use it, but it’s nice to know there’s an easy way to solve any basic issues you’re having with your iPhone with an app.