Samsung Galaxy Watch4 40mm vs Samsung Galaxy Watch Ultra (2025)

Exynos W920

Exynos W1000

Dual-core, 2 at 1.18GHz

Penta-core, 1 @1.6GHz and 4 @1.5GHz

16GB

32GB | 64GB

1.5

2GB

Wear OS Powered by Samsung

Powered by Samsung 5.0

Subject to change based on future operating system updates

Yes

Yes

Bands 2, 4, 5, and 12

Bands 2, 4, 5, 12, 13, 14, 25, 26, 66, 71

HSPA+ with enhanced backhaul

850/1900MHz

850/900/1700/1900/2100MHz

Yes

Yes

Yes

Yes

802.11a/b/g/n

Wi-Fi 4 (802.11n)

2.4GHz & 5.0GHz

2.4GHz & 5GHz

Open, Secure

Open, Secure

v5.0 + EDR, A2DP, HS, LE

v5.3 + EDR, A2DP, HS, LE, aptX®

Yes

eSim

eSim

Yes

Yes

Accelerometer, Ambient Light, Barometer, Gyroscope, Heart Rate, E-Compass, Magnetometer, ECG

Accelerometer, Ambient light, Barometer, Gyroscope, Heart rate, Temperature

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

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

Outlook

Microsoft Outook

Yes

Music

Music

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

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

Yes

Yes

This device is not hearing aid compatible.

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)

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

4/4

2/3

2/3

1/1

1/1

2/2

2/2

10/10

10/10

19/20 (5-star) Please visit www.att.com/ecospace for additional information