. . . of course, they're both broken. But they're broken in easily-fixable ways!
Specifically, they both need new screen/digitizers. I broke the glass on the US not once but twice, leading to this. And I tried transplanting the screen/digitizer on the UK one but I broke the cable running from the digitizer to the motherboard because I'm clumsy.
The US one still works even though the glass is a disaster, and the UK one was fine until I went messing with it. Both have been factory reset.
You can get the screen/digitizer unit for about forty bucks. Of course, the whole phone was $80 on Verizon here in the US, which is why I didn't bother to replace the US one, but if you're on a tight budget or you want parts for a science experiment or whatever, one or both of them are yours; I'll ship anywhere.