https://blog.al4.co.nz/2015/01/good-news-for-z3-compact-owne...
But it seems like it was a very deliberate choice by Sony.
I mean, they had everything; the design chops, the brand power, the tech, the Sony Stores, etc... Everybody knows the iPhone, Sams's Galaxy, LG G series, Moto phones, but Sony really failed to market their Xperia phones properly.
Just for fun, I went to Sony Canada's website to look at their phones and they have 21 models on the page. I'm not joking. https://www.sonymobile.com/ca-fr/products/phones/
The only good Android phones I've used (and I've been using Android since the G1) have been ones Google had a hand in: Nexuses, the original Moto X, and the Pixel. The Sony came close, but the heat problems killed it for me.
I would still jump on a well done, small, Android phone.
The Android ecosystem is difficult to recommend, and a small Android phone is even more difficult to recommend.
I haven't seen an authorized seller for Xiaomi and I was under the impression that they are still using marshmallow or earlier. Also all their phones are 4.5"+ which is much larger than the comparably compact SE.
I'd love to get a xiaomi phone (esp. based on the price and alleged build quality) but it's just not worth the tradeoffs.
I found that despite not always being on the latest version of Android, they had enough polish and stability on their OS to make it worth being a version behind. I used their ROMs back before they made hardware, and if there was ever a bug, it was usually fixed within a week (or at least acknowledged).
And I agree, I'd love for Xiaomi to sell phones, but like everyone else is stating, the iPhone SE is arguably one of the best compact phones. I hope to have mine for many years.
To make sure that phone's frequency will work: https://www.frequencycheck.com/
Listings of great phone: https://www.kimovil.com/en/