This is a dual-SIM Sony model G8342, codename Poplar_US, Customization Version 1310-4358_R5B.As of November 2017 this phone runs on Sony build 47.1.A.2.374, Oreo 8.0.0, 2017-10-01 patch level.This is important: You may not be able to update the phone to October update over the air, but instead use official XPERIA Companion application from Sony and perform device reset. You definitely want to update your device to the latest version, since it fixes Camera freezes in third-party applications and stops Launcher from fighting you.Summary after almost a month of use:You should get this phone if: • You like metal design and screen size, and • You don't mind taking pictures of mediocre quality (not potato, but details are regularly lost), and • You must use two SIM cards, and • You live in an area with good 2G/3G coverage for regular phone calls, and • You don't need Wi-Fi calling or VoLTE. • You want HDR-capable screen.Otherwise, get the XPERIA XZ1 Compact or wait for other phones with Oreo.We probably should have got the Single-SIM variant, which had a higher chance of supporting Wi-Fi calling and VoLTE, but G8342 is what we now have to deal with.I am returning the phone and plan to get XPERIA XZ1 Compact instead, which has VoLTE and Wi-Fi calling listed as officially supported with a single SIM card.The Good: • Great screen which can slightly alter colors if the device detects broad daylight (see photo). You can adjust the color temperature and even switch between color profiles. • This is the first Android Oreo phone that comes with a headphone jack. You don't hear the hissing noise/clicks when DAC is turned on/off, and the sound feels... different. I like it. • Camera button, which works in lock screen as well. • Front-facing speakers that produce sound you are unlikely to cover with your fingers. • Android Auto works great. • Front-facing camera is a widescreen one, so it fits more of your face and people around you.The Bad: • The phone is not provisioned for VoLTE in the US market, so you won't have HD Audio, probably due to Dual-SIM support and lack of Sony interest. This makes this phone unusable for calls in areas where LTE is the only option available (such as in areas where only LTE Band 12 is deployed by T-Mobile). • The phone is not provisioned for Wi-Fi calling, so you won't be able to make or receive voice calls if you don't have cell coverage, also possibly due to Dual-SIM configuration. • You'll appreciate the headphone jack, since bluetooth may be unstable, depending on the device you're pairing with. • After a week the following stopped bothering me that much, but the status bar Wi-Fi and mobile internet icons display up/down arrows when activity happens. Unfortunately, when arrows show/hide, the icons to the left are shifted back and forth.The Ugly: • The main camera seems to be worse at details than LG Nexus 5 of 2013 (see sample image, top is XZ1, bottom is Nexus 5). It introduces noise and grain due to over-sharpening which cannot be turned off (don’t forget to complain about that to XPERIA Support). Those are not just JPEG artifacts, or settings you can adjust. You may be tempted to try other camera apps, but that won’t fix the issue. Additionally, camera produces wide-angle distortions, but Sony publicly announced an upcoming fix for that as a setting.Accessories:Unfortunately, neither TechArmor nor RhinoShield have plans to support this phone and Spigen did not react to my question to confirm or deny they are going to bring XZ1 accessories to the US and the currently available selection is disappointing.• Skinomi TechSkin Full Coverage Screen Protector - This is a soft film protector, which should help from scratches and does not change visibility. • Vigeer Crystal Clear Soft TPU Bumper - This is an OK case which will definitely protect the phone, but soft TPU sticks to other plastic (such as badge holders) and looks stretchy. • Roxfit Ultra Slim Soft Touch Shell - This case feels good in hand, but provides protection mostly to the back and the sides of the phone and not so much for the front due to minimal lip.