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Required to use smartwatch over cellular; rate plan required

Yes

802.11b/g/n

802.11a/b/g/n

2.4GHz and 5GHz

2.4GHz & 5.0GHz

Open, Secure

5.3

v5.2 + EDR, A2DP, HS, LE, aptX®

Yes

Electronic SIM

eSim

HSPA+ with enhanced backhaul

Bands 1, 2, 3, 4, 5, 7, 12, 13, 17, 18, 19, 25, 26, 39, 40, 41, 66

Bands 2, 4, 5 and 12

850/1700/1900/2100MHz

850/1900MHz

Yes

Generates an ECG¹¹ similar to a single-lead electrocardiogram.

Track your daily activity on Apple Watch, and see your trends in the Fitness app¹⁰ on iPhone.

Siren, Backtrack, Fall Detection,⁸ Emergency SOS,⁹ and Crash Detection.

Keep tabs on your resting, walking, and workout recovery heart rate.

Improved Workout app with new metrics, new views, and advanced ways to train.

Electrical heart sensor and ECG app

Third-generation optical heart sensor

High and low heart rate notifications

Irregular rhythm notifications¹²

Sleep stages

Temperature sensing¹³

Compass

Always-on altimeter

High-g accelerometer

Up to 256 g-forces with Fall Detection and Crash Detection

High dynamic range gyroscope

Ambient light sensor

Accelerometer, Ambient light, Barometer, ECG, Geomagnetic, Gyroscope, Heart rate, Infrared temperature

Yes

Yes

Insert pictures, video clips and sound clips easily (messaging charges apply)

Microsoft Outlook

Apple Music®

Samsung Music

MP3, M4A, 3GA, AAC, OGG, OGA, WAV, AMR, AWB

Via lockscreen

Yes

The AT&T Eco-Rating 2.0 system gives you environmental and social details about this device. The system uses a total of 20 performance criteria across 5 different attributes, for a total rating of 1 to 5 stars: 19-20 (5-star), 16-18 (4-star), 13-15 (3-star), 10-12 (2-star), 8-9 (1-star)

4/4

2/3

1/1

2/2

10/10