SAMSUNG Galaxy Watch 4 LTE 46mm Smartwatch - Health & ECG

In this review the SAMSUNG Galaxy Watch 4 LTE 46mm is assessed as a health-forward smartwatch best suited for users who want in-depth body and heart metrics on the wrist. The bottom line: it stands out for its body composition analysis and medical-style tracking, letting active users and anyone monitoring heart health get detailed readings without extra devices. It also functions as a true phone extension with LTE, so the watch can handle calls and messages on the go while still delivering advanced fitness and sleep data.

Key Features

• Body composition analysis: Provides on-wrist readings for body fat, skeletal muscle, body water, basal metabolic rate and BMI so users can track changes over time without a separate scale.
• Advanced sleep tracking: Continuously monitors sleep stages and SpO2 through the night to help users improve rest and wake feeling more refreshed.
• ECG monitoring: Captures accurate electrocardiogram readings and flags possible atrial fibrillation, enabling users to share results with their doctor using the Samsung Health Monitor app.
• Automatic workout detection: Recognizes six popular activities automatically within minutes and supports connected live coaching and group challenges for motivation.
• Built-in LTE and phone extension: Lets users call, text and stream music from the wrist without carrying a phone, maintaining connectivity on runs and errands.
• Running performance tools: Includes VO2 Max estimates and advanced running coaching features to help improve endurance and training quality.

Who It's For

The Galaxy Watch 4 LTE is ideal for fitness enthusiasts and people focused on health monitoring who want a single device to measure body composition, ECG, sleep and workout metrics. It suits runners and swimmers who need GPS, VO2 Max guidance and automatic activity detection while remaining connected with LTE.

Those who want a basic smartwatch with long battery life or who rely on non-Galaxy phones for specialized health apps may want to compare alternatives; the deepest health features are designed to pair with compatible Galaxy phones and Samsung Health workflows.

Pros & Cons

Pros

• Comprehensive body composition readings on the wrist remove the need for extra hardware.
• Continuous sleep and SpO2 tracking helps identify sleep quality trends.
• Accurate ECG monitoring and easy sharing with physicians via app integration.
• LTE support makes the watch a practical phone alternative for calls and streaming.

Cons

• Some advanced features work best when paired with a compatible Galaxy phone, which may limit full functionality for other phone users.

Specifications

Model	Galaxy Watch 4 LTE 46mm (US version)
Connectivity	LTE, Bluetooth, GPS
Health sensors	ECG, SpO2, body composition analysis
Activity tracking	Automatic recognition of 6 activities, running coaching, VO2 Max
Sleep tracking	Advanced sleep stages and continuous SpO2 monitoring
Color	Black

Our Verdict

The Galaxy Watch 4 LTE 46mm is a strong choice for anyone who prioritizes detailed health metrics and wants the convenience of LTE connectivity. It delivers unique on-wrist body composition and medical-style ECG features alongside solid fitness tracking, making it good value for users who will use the Samsung Health ecosystem and run or train frequently.

Frequently Asked Questions

Does the watch record ECG that can be shared with a doctor?
The watch captures ECG readings and you can export or share the data using the Samsung Health Monitor app on a compatible Galaxy phone.

Can it track sleep and blood oxygen all night?
Yes, the Galaxy Watch 4 provides continuous sleep stage tracking and SpO2 monitoring to help assess sleep quality.

Will it work without a phone nearby?
With LTE enabled the watch can make calls, send messages and stream music independently, though some health features are best used with a paired Galaxy phone.