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Yes

Required to use smartwatch over cellular; rate plan required

802.11n

802.11b/g/n

2.4GHz

2.4GHz and 5GHz

Open, Secure

v5.2 + EDR, A2DP, HS, LE

5.3

Yes

eSim

Electronic SIM

Bands 2, 4, 5, 12, 13, 17, 25, 26, 66, 71

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

850/1700/1900/2100MHz

Yes

Accelerometer, Ambient Light, Barometer, cEDA, Gyroscope, Heart Rate, Magnetometer, Skin Temp, SpO2

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

Yes

Send and receive text messages from your wrist (messaging charges apply).

Yes

YouTube Music

Apple Music®

FLAC, M4A, MP3, OGG, WMA

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)

3/4

3/3

1/1

2/2

7/10

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.