Just months after the OnePlus 3 came out, it's being replaced with an updated model that offers better performance. For starters, the OnePlus 3T is one of the fastest phones on the market, thanks to its zippy new Snapdragon 821 processor. And now, post-update, it's also one of the longest-lasting.

Extremely long battery life; Front camera performs well in low light; Excellent performance

No microSD card slot; Only compatible with GSM carriers like AT&T and T-Mobile; Dash charger doesn't work with all cables

The faster processor, an improved front-facing camera, and larger battery capacity also results in a bump in the price point, with the 64 GB model priced at $439, and the 128 GB iteration setting you back an additional $40.

-Thin and light metal design; Beautiful 1080p panel DASH charging works as advertised Great all day battery life Performance is smooth and responsive Great all around rear camera Improved front facing camera Dual SIM Fast fingerprint sensor OxygenOS is more refined

No expandable storage Single bottom firing speaker

A true flagship killer!

Battery; design; quality; OS; fingerprint & more

Camera is average

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 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

It does everything really, really well, and while it may not truly excel in areas such as screen resolution and camera quality, the OnePlus 3T is still astonishingly good value for what is a serious flagship contender.

Great battery life; Super-slick performance; Still an affordable flagship

No microSD slot; Slightly more expensive; Incremental upgrades

The OnePlus 3T will be unfairly compared, for now at least, to the phone that came before it. So let's ignore it. On its own, the OnePlus 3T is everything a modern smartphone should be; slim, fast, and responsive, with above average battery life and cameras that produce stunning images.

At the end of November last year I was sent a OnePlus 3T . This appeared relatively hot on the heels of the OnePlus 3 , which I'd reviewed in the middle of 2016, judging it to be the best smartphone in its price range.

Attractive design; Solid build; Dual SIM slots; Excellent battery life; with fast charging; 64GB or 128GB internal storage options

No MicroSD card slot

Editors' Note: Since the June 2017 release of the OnePlus 5, OnePlus is phasing out 3T production and will no longer actively sell the phone. You can read CNET's OnePlus 5 review here.

This is our new favorite budget Android, but if you have the OnePlus 3, you don't need to upgrade.

The OnePlus 3T's battery lasts way longer; takes sharper selfies and has a 128GB storage option.

Pricier than the OnePlus 3; the 3T now directly competes with better phones.

Despite being only a couple of years old in the Indian smartphone market, OnePlus has a rather strong foothold in the arena, all credits to its debut "flagship killer" smartphone, the OnePlus One.

An All-rounder

Non-expandable storage