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It’s unlikely to be the proximity sensor doing this, as then it would work with third party cases as well, not just Apple’s and would do something similar when just covering or uncovering the screen.
It's not necessary to unsolder the battery back for this at all, as long as you're careful not to pull on the battery wires, all you have to do is leave it attached and make sure it doesn't move too far from the board.
Once they have, you'll be able to view a graph of their reputation gained over time.
Here's a preview of what the graph will look like:
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