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Pair an Apple Watch Series 4 from the Apple Watch app—not the iPhone’s Bluetooth settings. Before starting, verify that your iPhone, iOS version, watch variant and watchOS version are compatible: Apple lists Series 4 through watchOS 10.6.1, while watchOS 26 starts with Series 6 and newer supported models.
Then turn on the watch, unlock the iPhone, choose Continue in the pairing assistant, scan the watch animation and leave both devices close while synchronization completes.
Check compatibility before pairing
Apple’s compatibility table lists these Series 4 combinations:
| Watch | Apple-listed iPhone requirement | Series 4 software range |
|---|---|---|
| Series 4 GPS | iPhone 5s or later with iOS 12 or later | watchOS 5 through watchOS 10.6.1 |
| Series 4 GPS + Cellular | iPhone 6 or later with iOS 12 or later | watchOS 5 through watchOS 10.6.1 |
These are Apple’s listed combinations, not a guarantee that every newer iPhone running the newest iOS will pair. Check the exact model and software on Apple’s compatibility table. As of August 18, 2026, Apple lists watchOS 26 support beginning with Apple Watch Series 6, newer SE models and Ultra models; Series 4 remains capped at watchOS 10.6.1.
#1 Best Overall
- LEAVE YOUR PHONE IN YOUR POCKET: Apple Watch Series 6 GPS Model lets you call, text, and get directions from your wrist, while leaving your phone in your pocket. It offers multiple connectivity options, including: Bluetooth, Wi-Fi, and NFC to suit all of your possible needs.
- ALWAYS-ON RETINA DISPLAY: You no longer need to raise your wrist or touch the screen to see the time or other information on your watch face, because the display never sleeps. All you need to do is glance to find the time or your workout metrics right there where you want them.
- ECG ON YOUR WRIST: With the ECG app, Apple Watch Series 6 is capable of generating an ECG similar to a single-lead electrocardiogram. It’s a momentous achievement for a wearable device that can provide data for doctors and peace of mind for you wherever may be during the day.
- WORKOUTS THAT DON'T QUIT: Cycling, yoga, swimming, high-intensity interval training.the list goes on. You me it, Apple Watch measures it. Set workout-specific goals, see full summaries when you’re done, and track how you’re trending over time in the Activity app on your iPhone.
- GET LOST IN YOUR MUSIC: With Apple Music on your wrist, you’ve got 60 million tracks of musical motivation to take you places. You can also catch up on the latest podcasts or listen to an audiobook if that's your thing. Stream everything you need right from your watch, even without your phone.
Have these ready
- Apple Watch Series 4 and its magnetic charger.
- A compatible iPhone connected to Wi-Fi or cellular data, with Bluetooth enabled.
- Your Apple Account email address or phone number and password.
- The watch passcode, if it already shows a configured watch face.
- At least 50 percent charge on both devices when transferring to a new iPhone; Apple recommends this for transfer operations.
A watch showing a normal clock face or requesting an existing passcode may still be paired to another iPhone. Use the transfer or unpairing instructions below instead of repeatedly attempting a new pairing.
Pair a Series 4 for the first time
- Charge and start the watch. Put it on the charger if needed. Press and hold the side button until the Apple logo appears.
- Prepare the iPhone. Unlock it, turn on Bluetooth in Settings > Bluetooth, and connect to Wi-Fi or cellular data.
- Open the pairing assistant. Hold the iPhone near the watch. When the prompt to use the iPhone to set up Apple Watch appears, tap Continue. If no prompt appears, open the Apple Watch app, tap All Watches, then Add Watch or Pair New Watch; wording can vary by iOS version.
- Choose the owner. Tap Set Up for Myself.
- Scan the animation. Center the moving pattern on the watch inside the iPhone’s viewfinder. Keep the watch and phone steady until pairing completes.
- Complete setup. Follow the prompts to accept terms, sign in to your Apple Account, create a watch passcode if wanted, and configure features such as location, notifications and Apple Pay.
- Choose your data path. Select Restore from Backup when replacing an iPhone or resetting a watch and a suitable backup exists. Choose Set Up as New Apple Watch for a clean start or when no usable backup is available.
- Configure cellular service, if applicable. A GPS + Cellular model may offer activation during setup. You can also do this later in the Apple Watch app.
- Wait for synchronization. Keep both devices close, powered and unlocked as needed until the watch reaches its normal watch face and the Apple Watch app shows setup is complete.
Apple documents this camera-based process and its fallback in the Apple Watch setup guide.
If the camera cannot scan the pairing animation
- Improve the lighting and clean both the iPhone camera lens and watch display.
- Center the animation in the viewfinder and hold the devices steady.
- Tap Pair Apple Watch Manually at the bottom of the pairing screen.
- Follow the onscreen instructions and enter the six-digit code shown on the watch when requested.
Manual pairing is useful when the camera cannot focus, the display is damaged, the animation will not appear or accessibility needs make scanning difficult. Apple describes the six-digit fallback in its secure-pairing documentation.
Rank #2
![Apple Watch SE 3 [GPS 40mm] Smartwatch with Starlight Aluminum Case with Starlight Sport Band - S/M. Fitness and Sleep Trackers, Heart Rate Monitor, Always-On Display, Water Resistant](https://m.media-amazon.com/images/I/31YiTby0pOL._SL160_.jpg)
- GET SMARTER HEALTH INSIGHTS—Apple Watch SE 3 is an advanced health tracker that helps you better understand your body. The smartwatch sends alerts for an irregular heart rhythm, or an unusually high or low heart rate.* You can view your overnight health tracking metrics with the Vitals app,* track your sleep score, and get sleep apnea notifications.*
- A GREAT FITNESS TRACKER—SE 3 can track your workouts in a healthy number of ways—from running and strength training to simply achieving your 10K steps a day. With real-time metrics and Workout Buddy powered by Apple Intelligence from your nearby iPhone,* you’ll hit your goals like never before.
- KEEP HELP CLOSE AT HAND—SE 3 is a smartwatch that can detect a hard fall or severe car crash and automatically help connect you to emergency services and notify your emergency contacts.* Check In can automatically notify a loved one when you’ve arrived at your destination.
- WOMEN’S HEALTH INSIGHTS—SE 3 has advanced sensors that track your wrist temperature while you sleep. With this smartwatch, you can log your periods and symptoms, get period predictions, and get notified of cycle deviations.*
- GREAT BATTERY LIFE AND FASTER CHARGING—Enjoy a smartwatch with all-day, 18-hour battery life* from sunup to sundown. Then charge up to twice as fast as SE 2* and get up to 8 hours of battery in just 15 minutes.*
Move Series 4 to a new iPhone
Transfer is safer than treating an already configured watch as a brand-new device because it preserves more settings and data when a valid backup is available.
- Update the old iPhone and Apple Watch as far as their hardware and compatibility allow.
- On the old iPhone, enable Health in iCloud if you use iCloud syncing.
- Back up the old iPhone. If you use a computer backup, make it encrypted so Health and Activity data can be included.
- Set up the new iPhone from the most recent backup.
- Keep the watch unlocked, on your wrist or nearby, and close to the new iPhone.
- Open the Apple Watch app on the new iPhone and follow the transfer prompt.
- If the new iPhone instead shows Start Pairing, unpair the watch from the old iPhone, then pair it again and restore the available watch backup or choose Set Up as New Apple Watch.
Apple says an iPhone backup also backs up the Apple Watch. However, iCloud does not store Activity Sharing data; without the original device or an appropriate backup, some Health and Activity content may not be recoverable. See Apple’s new-iPhone transfer guidance and missing-data troubleshooting.
If the watch is already paired to another iPhone
When the old iPhone is available
- On the old iPhone, open Apple Watch.
- Tap My Watch, then All Watches.
- Tap the information button next to the watch.
- Tap Unpair Apple Watch and confirm.
- Choose whether to keep or remove the cellular plan.
- Enter the Apple Account password when asked to disable Activation Lock.
- Pair the erased watch with the new iPhone.
Unpairing from the paired iPhone erases the watch and removes Activation Lock. Apple’s exact flow is in its unpairing guide.
Rank #3
![Apple Watch Series 11 [GPS 42mm] Smartwatch with Rose Gold Aluminum Case with Light Blush Sport Band - S/M. Sleep Score, Fitness Tracker, Health Monitoring, Always-On Display, Water Resistant](https://m.media-amazon.com/images/I/31caPPnRysL._SL160_.jpg)
- A FULL-FEATURED HEALTH TRACKER—Apple Watch Series 11 gives you invaluable insights about your body, right from your wrist. Take an ECG anytime* and get alerts for a high and low heart rate or an irregular rhythm*—so you can stay closer to your heart. You can also view your overnight health tracking metrics with the Vitals app* and be notified of possible sleep apnea.*
- KNOW YOUR SLEEP SCORE—With advanced sleep tracking, Series 11 gives you a daily sleep score. It’s an easy way to help measure and understand the quality of your sleep, so you can make it more restorative.
- GET HYPERTENSION NOTIFICATIONS—Did you know that Series 11 can spot signs of chronic high blood pressure? By analyzing how your blood vessels respond to beats of the heart, it can notify you of possible hypertension.*
- SAFETY FEATURES—A smartwatch that puts your safety first. Series 11 can detect a hard fall or severe car crash, automatically help connect you with emergency services, and notify your emergency contacts.* Check In can automatically notify a loved one when you’ve arrived at your destination.
- A POWERFUL FITNESS TRACKER—With advanced metrics and motivating features like Pacer, Heart Rate Zones, training load, and Workout Buddy powered by Apple Intelligence from your nearby iPhone*—Series 11 is made to help everyone stay active, from runners and hikers to strength-training enthusiasts.
When the old iPhone is unavailable
- On the watch, open Settings > General > Reset.
- Tap Erase All Content and Settings.
- Enter the watch passcode if requested and confirm.
This erases the watch but does not remove Activation Lock. The Apple Account previously linked to it will still be required.
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An Activation Lock screen means the watch is still linked to the previous owner’s Apple Account. The buyer cannot legitimately bypass it. Ask the seller to unpair the watch correctly or remove it from their account through Find My, then start setup again. A factory reset by itself is not enough. Apple explains the requirement for the linked account credentials in its Activation Lock support article.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Cellular setup and limitations
On a Series 4 GPS + Cellular model, activation may appear during setup or later under the Apple Watch app’s cellular settings. Apple normally requires the iPhone and watch to use the same carrier, but support depends on country, carrier, account type and the particular plan. A cellular-capable watch therefore does not guarantee that service can be activated or transferred.
Rank #4
![Apple Watch SE 3 [GPS 40mm] Smartwatch with Midnight Aluminum Case with Midnight Sport Band - S/M. Fitness and Sleep Trackers, Heart Rate Monitor, Always-On Display, Water Resistant](https://m.media-amazon.com/images/I/31Gq8SToFJL._SL160_.jpg)
- GET SMARTER HEALTH INSIGHTS—Apple Watch SE 3 is an advanced health tracker that helps you better understand your body. The smartwatch sends alerts for an irregular heart rhythm, or an unusually high or low heart rate.* You can view your overnight health tracking metrics with the Vitals app,* track your sleep score, and get sleep apnea notifications.*
- A GREAT FITNESS TRACKER—SE 3 can track your workouts in a healthy number of ways—from running and strength training to simply achieving your 10K steps a day. With real-time metrics and Workout Buddy powered by Apple Intelligence from your nearby iPhone,* you’ll hit your goals like never before.
- KEEP HELP CLOSE AT HAND—SE 3 is a smartwatch that can detect a hard fall or severe car crash and automatically help connect you to emergency services and notify your emergency contacts.* Check In can automatically notify a loved one when you’ve arrived at your destination.
- WOMEN’S HEALTH INSIGHTS—SE 3 has advanced sensors that track your wrist temperature while you sleep. With this smartwatch, you can log your periods and symptoms, get period predictions, and get notified of cycle deviations.*
- GREAT BATTERY LIFE AND FASTER CHARGING—Enjoy a smartwatch with all-day, 18-hour battery life* from sunup to sundown. Then charge up to twice as fast as SE 2* and get up to 8 hours of battery in just 15 minutes.*
Troubleshoot by symptom
No pairing prompt appears
- Unlock the iPhone and place it immediately beside the watch.
- Confirm Bluetooth is on and Wi-Fi or cellular data is working.
- Open Apple Watch > All Watches > Add Watch manually.
- Restart both devices.
- Check that the watch is not already paired or Activation Locked.
The iPhone cannot connect
- Confirm the iPhone model, iOS version, watch variant and watchOS version meet Apple’s compatibility requirements.
- Restart both devices and try again.
- Update software where possible.
- If the watch is stuck in an earlier pairing state, erase it and pair again—but remember that direct erasure leaves Activation Lock active.
Apple’s troubleshooting sequence starts with checking whether the watch is already paired and restarting both devices; see Apple’s pairing troubleshooting page.
The watch is stuck on the Apple logo or pairing screen
This recovery erases the watch:
- Press and hold the Digital Crown and side button together until the watch restarts.
- Release both controls.
- Firmly press the display or press and hold the Digital Crown when prompted.
- Tap Reset, then pair the watch again.
Use this only when you accept the data loss; Apple documents the procedure in its transfer and recovery guidance.
Quick wins for a faster PC:
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The watch is usually still configured or protected by its existing pairing. Do not guess repeatedly. Erase it, then provide the linked Apple Account credentials if Activation Lock appears.
Quick Recap
Pairing Not Complete or missing Health data
- Keep the devices together and powered while synchronization continues.
- Confirm Health is enabled in iCloud on the relevant iPhones.
- Restore from the correct watch or iPhone backup.
- Use an encrypted computer backup when transferring Health and Activity data through a computer.
- Allow time for iCloud data to repopulate.
- Remember that Activity Sharing data is not stored in iCloud.
Cellular activation fails
- Verify that the watch is the GPS + Cellular model.
- Check carrier and regional support for Apple Watch Series 4.
- Confirm the iPhone and watch meet the carrier’s plan and account requirements.
- Try activation later in the Apple Watch app if setup was completed without cellular service.
Final setup checklist
- The watch appears in the iPhone’s Apple Watch app.
- The watch reaches its normal face without a pairing or Activation Lock prompt.
- Synchronization has finished.
- Your Apple Account is signed in.
- A passcode is configured if you want one.
- The cellular plan is active, if your model and carrier support it.
- Health and Activity history has appeared, subject to the backup limitations above.
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