[vladvasiliu]

When I had my iPhone battery changed, they explicitly said it should be unlocked and / or I should give them the code. So I went through the trouble of backing everything up, wiping the phone clean, and then reinstalling everything when I got it back.

If there was some kind of "status debug port" or whatever, the technicians could've done the various checks the sibling talks about without needing full control of my phone.

[silversnitch]

I replied to another thread and adding here again, they have diagnosis tool built into iPhone that can be triggered over the network when connected to same WiFi. This also works when Phone is locked.

This is how my repair went through. At no point they asked for my passcode or to unlock Phone.

[vinni2]

This.