The OnePlus 3T is a device that's stood on the shoulders of its predecessor to get ahead of the pack of top-tier smartphones on the market today. Instead of releasing an all-new smartphone, OnePlus has opted to chop their update schedule in two.

Pricing is still great; even $100 over OnePlus 3; Hardware is high quality; AAA production; Camera is amongst best in any smartphone; OnePlus supports ROM development; does not void warrantee for root; Display is top notch

No waterproofing; no dust-proofing; Phone's industrial design feels caught between safe and unique; OnePlus-made cases look cool; but offer little protection; Fingerprint scanner not quite as quick as Pixel XL or iPhone 6s/7

With a better processor, battery, and front camera, the OnePlus 3T is a tune-up of an already great phone.

Great specs for the money; Larger battery ensures a full-day's charge; Adds 128GB option

Costs $40 more than the OnePlus 3; Higher-resolution front camera doesn't add much to selfies; Still no Verizon or Sprint support

The OnePlus 3T is the flagship killer. The OnePlus 3's crown is being taken by the 3T. What was best about the OnePlus 3 is now made even better by the 3T: an upgraded Snapdragon 821 processor, a larger battery, an improved front camera and various software adjustments.

Good camera; Fluid; customizable interface; Quick "Dash Charge" system; High performance

No design update since the OnePlus 3; No microSD slot; Only Full-HD (1920x1080) Screen Resolution; No Android Nougat yet

But now you can't buy the OnePlus 3. Instead, OnePlus has decided to replace it with an even better version: the OnePlus 3T. The 3T shares many of the same qualities as the 3, including the same materials and design; same size and resolution display; same 6GB of RAM; and same rear camera.

Great build quality; Fast processor and performance; Long battery life

Doesn't work on Verizon or Sprint; No certified water resistance; Quick charging limited to included cable and power brick

The previous OnePlus 3 was already the best phone for the money, and while the 3T's $439 starting price has upped the ante a bit, improved performance and an extra 2 hours of battery life are worth the extra $40.

Excellent battery life; Great performance; Superfast Dash charging

Limited to GSM carriers; Display could be brighter

Well that went quickly-the OnePlus 3 was a great phone, and when you don't change much, there isn't much to talk about. We doubt anyone would notice the camera and performance changes between the 3 and the 3T, so at the end of the day, you're really paying $40 for more battery life.

$439 for a 64GB phone is a fantastic price; The aluminum unibody is still great; Speedy SoC (a Snapdragon 821) and surprisingly speedy storage; just like its predecessor; It still has all the right extras: a fast; accurate fingerprint reader; USB Type-C; and NFC; Customizable; lightweight Android...

No MicroSD slot; Slow monthly and major Android updates; If you're going to upgrade a camera; upgrade the rear one

Several weeks after the OnePlus 3 came out, Ian Hardy, MobileSyrup ‘s publisher, asked me whether the website should run a "three months later" feature on the device. "Bossman," I said, "shouldn't we wait until the phone is at least six months old?

Superb performance & improved battery life; Near stock Android with smart additions; Handsome new Graphite colour

$100 more expensive; OnePlus 3 is still a great smartphone; Not water or dust proof like other flagships

The OnePlus 3T is hands down the best high-performance Android phone you can buy on a budget.

Blazing speed from Snapdragon 821 chip; Impressive cameras; Beautiful metal body; Smooth Android experience with regular updates; Very fast charging battery

Not water-resistant; Some software issues need fixing

It has usually been Apple who can get away with incremental changes to their flagships. OnePlus have learn't from the master of the game. And so six months after the OnePlus 3 made waves in the mid-range market, the disruptive manufacturer is back.

Top line processor; fantastic looks; Good battery; latest Android; Under-￡400

Incremental changes since OnePlus 3

What do you do when you have an already-great smartphone and access to parts that can improve it? If you're a traditional smartphone maker, you'll more than likely wait around 12 months before putting those upgraded parts into a slightly newer chassis.

Stunningly fast performance; longer lasting battery and Dash Charge super-fast recharge; great build quality; AMOLED display is bright and colourful

Still just a Full HD display; camera could be better; no microSD expansion; no Android 7.0 Nougat base (yet; anyway