Is this the 2017 model or the 2018 model?

The TA-1025 is the original Nokia 6, and the TA-1068 is the new Nokia 6.

I've seen other models of the Nokia 6 have problems with T-Mobile's 4G network and only run on the 3G or H+. Can anyone confirm or deny if this phone is working with T-Mobiles 4G?

I run this on the T-Mobile network in the U.S., and the phone connects via 4G as well as LTE.

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Nokia 6 TA-1025 Unlocked Smartphone with Dual Camera (5.5" Black, 32GB Storage 3GB RAM) US Warranty

Qualcomm Snapdragon 430 CPU, Octa-core (1.4 GHz)
PDAF Rear Camera with dual tone flash (16 MP) + 8 MP Front Camera
3GB RAM, 32GB built-in storage expandable up to 128GB (microSD Card support)
5.5" FHD display; 1920 x 1080; PPI: 403; Sunlight readability
3000 mAh battery
Dual speakers
Android 7.1.1 Nougat
Unlocked for freedom to choose your carrier. Compatible with AT&T and T-Mobile networks
Accelerometer (G-sensor), ambient light sensor, e-compass, Hall sensor, fingerprint sensor, gyroscope, proximity sensor, NFC (sharing)

Out of Stock