1. Introduction
Welcome to the user manual for your Apple Watch Series 4 (GPS + Cellular, 44mm). This guide provides essential information to help you get started, understand its features, and maintain your device. The Apple Watch Series 4 combines advanced health and fitness tracking with powerful communication capabilities, all on your wrist.

This image shows the Apple Watch Series 4, featuring its large display and the Digital Crown on the side. The screen displays a watch face with activity rings, heart rate, music, weather, and world clock complications. The watch is equipped with a black sport band.
2. What's in the Box
Upon unboxing your Apple Watch Series 4, you should find the following components:
- Apple Watch
- Charging Cable
- Charger
3. Setup
Follow these steps to set up your Apple Watch Series 4:
- Charge Your Apple Watch: Connect the magnetic charging cable to the back of your Apple Watch and plug the charger into a power outlet. Allow the watch to charge until it has sufficient power to begin setup.
- Power On: Press and hold the side button until you see the Apple logo.
- Pair with iPhone: Open the Apple Watch app on your iPhone. Tap 'Start Pairing' and follow the on-screen instructions. Position your iPhone so that the Apple Watch appears in the viewfinder in the Apple Watch app.
- Restore or Set Up as New: Choose to restore from a backup if you have a previous Apple Watch, or set up as a new Apple Watch.
- Sign In with Apple ID: Enter your Apple ID password when prompted.
- Cellular Setup (GPS + Cellular models only): If you have a GPS + Cellular model, you will be prompted to set up cellular service. Follow the instructions from your carrier.
- Create a Passcode: Set a passcode for your watch for security.
- Customize Settings: Adjust settings such as text size, activity tracking, and app preferences.
4. Operating Instructions
The Apple Watch Series 4 offers a range of features designed to enhance your daily life. Here are some key functionalities:
Key Features:
- GPS + Cellular: Stay connected, make calls, send messages, and stream music without your iPhone nearby. Requires an active cellular plan.
- Larger Display: Experience a more expansive view with over 30% larger screen area compared to previous models.
- Electrical and Optical Heart Sensors: Monitor your heart rate and rhythm with advanced sensors.
- ECG App: Take an electrocardiogram directly from your wrist to check for signs of atrial fibrillation (AFib). Consult a medical professional for interpretation.
- Digital Crown with Haptic Feedback: Navigate through watchOS with precise, tactile feedback.
- Louder Speaker: Enjoy clearer audio for calls and Siri interactions with a 50% louder speaker.
- S4 SiP with Faster 64-bit Dual-Core Processor: Experience improved performance and responsiveness.
- Improved Accelerometer and Gyroscope for Fall Detection: Automatically detects hard falls and can initiate an emergency call if you are unresponsive.
- Swim Proof: Designed for shallow-water activities like swimming in a pool or ocean. Not recommended for scuba diving, waterskiing, or other activities involving high-velocity water or submersion below shallow depths.
- watchOS 5: The operating system that powers your Apple Watch, offering new watch faces, activity competitions, Walkie-Talkie, and more.
5. Maintenance
Proper care ensures the longevity and optimal performance of your Apple Watch Series 4.
Cleaning:
- Watch: Wipe your Apple Watch with a non-abrasive, lint-free cloth. If necessary, lightly dampen the cloth with fresh water. Do not use soaps or cleaning products.
- Bands: Clean bands according to their material. Sport bands can be wiped with a damp cloth.
- Drying: Ensure your Apple Watch and band are completely dry before wearing or charging.
Battery Care:
- Regular Charging: Charge your Apple Watch regularly to maintain battery health.
- Avoid Extreme Temperatures: Do not expose your watch to extreme heat or cold, as this can degrade battery performance.
- Optimize Settings: Adjust settings like screen brightness and background app refresh to conserve battery life.
6. Troubleshooting
If you encounter issues with your Apple Watch, try these common troubleshooting steps:
- Restart Your Watch: Press and hold the side button until the power off slider appears, then drag the slider. To turn it back on, press and hold the side button again until you see the Apple logo.
- Force Restart: If the watch is unresponsive, press and hold both the side button and the Digital Crown for at least 10 seconds, until you see the Apple logo.
- Check Connections: Ensure your Apple Watch is properly paired with your iPhone and that Bluetooth and Wi-Fi are enabled on your iPhone.
- Update Software: Make sure both your Apple Watch and iPhone are running the latest software versions.
- Reset Sync Data: If health or activity data isn't syncing correctly, open the Apple Watch app on your iPhone, go to My Watch > General > Reset > Reset Sync Data.
- Unpair and Re-pair: As a last resort, unpair your Apple Watch from your iPhone and then re-pair it. This can resolve many software-related issues.
7. Specifications
| Feature | Detail |
|---|---|
| Model Number | MTUW2LL/A |
| Product Dimensions | 11.58 x 3 x 2.22 inches |
| Item Weight | 1.28 ounces |
| Manufacturer | Apple |
| Operating System | watchOS 5 |
| Memory Storage Capacity | 16 GB |
| Connectivity Technology | Cellular, GPS |
| Wireless Communication Standard | 802.11n |
| Battery Cell Composition | Lithium Ion |
| Screen Size | 44 Millimeters |
| Date First Available | November 1, 2018 |
8. Warranty and Support
For information regarding warranty coverage, technical support, and service options for your Apple Watch Series 4, please refer to the official Apple support website or contact Apple customer service directly. Keep your proof of purchase for warranty claims.
You can find additional support and resources at the official Apple Watch Support page.





