Happened to me also: I get sent an American model. Luckily Amazon fulfilled this item so they covered the return, which was painless.
I'd always recommend getting it from Amazon themselves or Google.
I nearly forgot to mention, I did actually end up purchasing another Nexus 5 directly from the Google Play store a couple of nights ago as the signal problems on this one from Amazon were starting to get unbearable (missing calls & delayed texts), the new one from Google has just arrived

I've also researched a lot on the XDA forum about the batch numbers and the different niggly issues that people have had with theirs (yellow tint on screen, quality control issues with the overall build). My first Nexus 5 off amazon is from batch 402K and this new one from Google is from batch 403K which I believe is the latest one.
On the 402K one I noticed that the actual build of the phone was totally flawless; no rattly power button as reported by loads of people, sim card tray totally flush with the fascia, bigger speaker holes, though it does have a slight yellow tint on the screen which seems to be widely reported amongst other users.
This newer 403K one that I've just received from Google - most importantly, no drop in signal at all so far which I'm pleased about (it does come with the latest 4.4.2 out of the box with the .23 radio)

Also, the seller on Amazon authorized the return of my first Nexus 5 this morning. However, he wants me to return it to an address in Hong Kong?!?! In someway I was expecting this as going by one of their negative reviews, another customer reported the same thing but when they challenged it with the seller after complaining that to send it back to China would cost nearly £25 they eventually gave in and supplied a UK return address so when I messaged the seller earlier on, I stated that I want a UK return address otherwise I'm taking this matter up with Amazon themselves.
Liam
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