We put the OnePlus One through its paces in our OnePlus One video review. (See also: 34 best smartphones of 2014 UK.)
The OnePlus One is a high-end smartphone running Android 4.4.2 KitKat. It boasts high-quality specifications, is bult to last and performs like a champion, but in the UK it retails for from just £229. What gives? Well, you need an invite to buy the OnePlus One, either by asking someone who has bought a OnePlus phone for an invite or by entering contests and promotional events hosted on the OnePlus Forums or social media channels. But if you can get it, you should. It's this year's Nexus 4: a true bargain smartphone. Our OnePlus One video review shows why.
Read our full OnePlus One review: bargain flagship Android is best deal smartphone of 2014 article for more detail.
OnePlus One review: Specification
You get a Qualcomm MSM8974AC Snapdragon 801, a quad-core Krait chip clocked at 2.5GHz. It's paired with 3GB RAM, and graphics are taken care of with a Adreno 330 GPU. Connectivity specs include 4G LTE, 802.11 a/b/g/n/ac Wi-Fi, NFC and Bluetooth 4.0. In use the One feels zippy. Transitions are snappy, and even running multiple processes the OnePlus One keeps things moving. It's as good a performer as we've seen in the Android space.
Overall then performance is great - especially at this price. (See also: Where is the OnePlus One phone? OnePlus One shipments delayed by customs.)
OnePlus One review: Storage
There are two storage options for the OnePlus One phone, and one big disappointment. The options are 16GB and 64GB onboard, but there is no storage expansion slot. We tested the 64GB model, which came with 54.8GB free out of the box.
OnePlus One review: Cameras
The OnePlus One has a 13 Mp Sony Exmor camera, with dual LED flash, and f/2.0 aperture. OnePlus tells us that the One camera has six physical lenses for greater detail, even at lower light conditions. It offers geo-tagging, touch focus, face detection, panorama and HDR, and captures video of up to 2160p (4K) at 30fps. It's a good but not grat smartphone camera. (See also: The UK's 33 best Android smartphones of 2014.)
OnePlus One review: Software
The OnePlus One runs Android 4.4.2 KitKat, which is a sufficiently recent version to be great. But it is a customised version of Android running an interface known as CyanogenMod.
You get access to Google Play. And when first you boot the OnePlus One you are asked if you want to run a custom OnePlus theme skin. If you opt not to go for this (we didn't) you get a very vanilla Android interface. It's all but a Nexus phone in that respect.
The interesting aspect is that you can install CyanogenMod themes that allow you to build your own skin for your smartphone. Choosing a specific theme allows you to tweak app icons and system fonts, your wallpaper, lock screen and so on. You can also specify changes to the way your smartphone works. But the themes cost money, mostly.
OnePlus One review: Battery life
The OnePlus One comes with a large Li-Po 11.8Wh (3100 mAh) battery cell. And we have been impressed with battery life.
OnePlus One review: Build and design
Initial impressions are good. The OnePlus is well put together, and made of what feels like high-quality materials. A big, understated slab of black, look closer and you will find subtle curves. There's a chrome outer rim surrounding the large glass display, which is slightly raised beyond the rest of the handset.
The OnePlus One measures 153 x 76 x 8.9 mm and weighs in at 162 g.
OnePlus One review: Display
The whole phone is built around the display. It's a 5.5in IPS LCD capacitive touchscreen display boasting 16M colours. The resolution is impressive: not the best on the market, but plenty good enough at the best at this price. Spread over 5.5 inches, 1080 x 1920 pixels makes for a pixel density of 401 ppi. (See also: OnePlus One release date, price, specs, pre-orders: Storm of Invites despite customs delay.)