To pair an old Apple Watch with a new iPhone, first confirm compatibility, update and back up the old iPhone, then set up the new iPhone from its latest backup. Keep the watch unlocked, on your wrist, and near the new iPhone when prompted. If the watch is still linked to the old iPhone and the new phone only shows Start Pairing, unpair it from the old iPhone first, then pair it again.
Do not erase or trade in the old iPhone until the watch is working on the new one. You will need the Apple Account password used with the watch and the watch passcode.
Before you start: check compatibility
An older Apple Watch does not automatically work with every newer iPhone. Compatibility depends on four things:
- the Apple Watch model;
- the iPhone model;
- the iOS version; and
- the watchOS version.
Check Apple’s current Apple Watch compatibility table for the exact combination before beginning. For example, Apple’s current requirements list Apple Watch Series 10 as compatible with iPhone XS or later running iOS 18 or later, with watchOS 11 or later. Newer models have newer requirements: Apple Watch Series 11, Apple Watch SE 3, and Apple Watch Ultra 3 require an iPhone 11 or later running iOS 26 or later. Those requirements apply to those newer watches; they do not mean that every older Apple Watch needs the same iPhone or iOS version.
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Older watches, including Series 3 and earlier, have substantially older operating-system limits. Identify the watch model and check its specific row rather than assuming that a new iPhone can run it.
What you need
- The old iPhone, if it is still available.
- The new iPhone connected to Wi-Fi.
- The Apple Watch connected to Wi-Fi during setup when possible.
- The Apple Account password associated with the watch.
- The Apple Watch passcode.
- The Apple Watch and new iPhone charged to at least 50 percent.
- Enough time for updates and restoration. Apple says updates can take several minutes to about an hour.
The pairing process does not require a special adapter, paid utility, or computer. If the watch cannot reach the recommended charge level, an Apple Watch magnetic charging cable can help with preparation. A cable charges the watch; it does not fix compatibility problems, pairing errors, or Activation Lock.
Affiliate disclosure: This article may contain monetized product references. The charging cable is optional and is mentioned only as a preparation accessory.
Step 1: Update the old iPhone and Apple Watch
Before moving the watch, install the latest software available for both devices:
- On the old iPhone, open Settings > General > Software Update and install the available iOS update.
- Place the Apple Watch on its charger and keep it near the old iPhone.
- On the iPhone, open the Watch app and go to My Watch > General > Software Update.
- Install the latest watchOS version available for that watch model.
Keep the devices charged and connected during the update. If the new iPhone is running software that is too new for the watch’s available watchOS version, pairing may not be possible; check compatibility before repeatedly attempting setup.
Step 2: Make a fresh backup, especially for Health and Activity data
Back up the old iPhone immediately before starting. The iPhone backup includes Apple Watch data, but Health and Activity information needs special attention.
If you use iCloud Backup
- On the old iPhone, open Settings.
- Tap your name at the top.
- Tap iCloud.
- Tap See All under the section showing apps using iCloud.
- Make sure Health is enabled.
- Return to Settings > [your name] > iCloud > iCloud Backup and make a fresh backup.
Health data already synchronized with iCloud can appear on other devices signed in to the same Apple Account with Health enabled.
If you back up to a Mac or PC
Create an encrypted computer backup. Apple recommends encryption so Health and Activity information can be included. An ordinary unencrypted computer backup may not contain that protected data.
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Do not erase the old iPhone after creating the backup. Keep it available until the watch has been paired and you have checked important data such as recent workouts, Activity rings, Health information, and watch settings.
Step 3: Set up the new iPhone from the latest backup
Turn on the new iPhone and follow the setup assistant. When asked how to transfer your information, choose the most recent iCloud backup or encrypted computer backup from the old iPhone.
During setup, the iPhone may ask whether you want to use the existing Apple Watch. If it does:
- Unlock the watch.
- Put it on your wrist.
- Keep it close to the new iPhone.
- Tap Continue and follow the onscreen instructions.
If the watch prompt does not appear, finish setting up the iPhone and use the Apple Watch app manually.
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Step 4: Finish pairing in the Apple Watch app
- Open the Watch app on the new iPhone.
- Keep the Apple Watch unlocked, on your wrist, and close to the phone.
- Follow the onscreen setup instructions.
- When offered a backup, choose the most recent Apple Watch backup available.
If the phone says Start Pairing even though the watch was already paired with the old iPhone, do not treat it as a normal transfer prompt. Unpair the watch from the old iPhone first, then return to the Watch app on the new iPhone and pair it.
If the old iPhone still works: unpair the watch from it
Using the old iPhone is the preferred route because it creates a backup of the watch, erases the watch, removes it from the old pairing, and removes Activation Lock as part of the unpairing process.
- Open the Watch app on the old iPhone.
- Tap My Watch.
- Tap All Watches at the top.
- Tap the information button next to the watch.
- Tap Unpair Apple Watch.
- Confirm and enter the Apple Account password when requested.
- If it is a cellular Apple Watch that you will pair again, choose to Keep Cellular Plan when asked.
After unpairing, open the Watch app on the new iPhone and pair the watch. If the watch contains important recent data, create the fresh iPhone backup before unpairing whenever possible.
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If the old iPhone is lost, damaged, traded in, or already erased
You can erase the watch directly, but this is different from unpairing it through the old iPhone. Direct erasure removes the watch’s content but does not remove Activation Lock.
- On the Apple Watch, open Settings.
- Tap General > Reset.
- Tap Erase All Content and Settings.
- Enter the watch passcode if requested and confirm.
- On the new iPhone, sign in with the Apple Account used to set up the watch.
- Open the Watch app and pair the erased watch.
- Try to restore from the available Apple Watch backup.
The watch may ask for the original Apple Account and password during pairing. That is expected. You may lose Activity, workout, or watch-setting changes made after the most recent usable backup. Health and Activity information that was already synchronized to iCloud can still update on devices signed in to the same Apple Account, provided Health is enabled.
If neither the old iPhone nor the watch is accessible, the account owner can use Find My through iCloud.com to erase the watch, select Remove, and deactivate it from the account. The exact web prompts can vary. The Apple Account owner must complete this process; a buyer or repair provider cannot legitimately bypass Activation Lock.
Activation Lock: why a secondhand Apple Watch may not pair
Activation Lock is connected to Find My and the Apple Account that originally set up the watch. The account email address or phone number and password may be required to:
- unpair the Apple Watch;
- pair it with a different iPhone; or
- turn off Find My.
If a used Apple Watch asks for someone else’s Apple Account credentials, the previous owner must remove it from their account. Erasing the watch, restarting it, or using a different iPhone will not bypass Activation Lock.
Before buying a used Apple Watch, have the seller unpair it in the Watch app on their iPhone and confirm that it reaches the normal setup screen without requesting the seller’s account.
Pairing another watch instead of transferring your only watch
If you are keeping the old watch as an additional watch rather than replacing it, use the Watch app on the new iPhone:
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- Open Watch > My Watch.
- Tap All Watches.
- Tap Add Watch.
- Follow the pairing instructions.
This is useful when you want more than one Apple Watch associated with the new iPhone. A watch that is still actively paired with another iPhone may need to be unpaired first.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Troubleshooting common problems
The new iPhone only shows “Start Pairing”
The watch is probably still associated with the old iPhone. On the old iPhone, use Watch > My Watch > All Watches > information button > Unpair Apple Watch. Then pair it from the new iPhone.
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The watch shows a clock face but will not connect
A normal clock face does not prove that the watch is ready for a new iPhone. It may still be paired with the old phone. Unpair it from the old iPhone when possible. If the old phone is unavailable, erase the watch directly and be prepared to enter the original Apple Account credentials because Activation Lock will remain.
The backup I need does not appear
Update the new iPhone and the Apple Watch first. Apple notes that outdated devices can prevent the expected backup from appearing. If the old iPhone is still available, make another backup after updating it and keep the phone connected to Wi-Fi until the backup finishes.
Health or Activity data is missing
On both iPhones, check Settings > [your name] > iCloud > See All and confirm that Health is enabled. Also confirm that you restored the latest backup and are signed in to the same Apple Account.
If the old iPhone cannot be backed up and the Health or Activity information was never synchronized to iCloud, Apple says that missing content cannot be recovered. Do not erase the old phone while there is still a chance to create a fresh encrypted computer backup or iCloud backup.
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Pair manually. Open the Watch app on the new iPhone, begin the watch setup process, and choose the manual pairing option on the Apple Watch setup screen when it is offered. Keep Bluetooth and Wi-Fi enabled and place the devices close together.
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The watch asks for another person’s Apple Account
This is Activation Lock. Contact the previous owner and have them remove the watch from their Apple Account through the Watch app or Find My. Do not pay for software claiming to bypass Activation Lock; legitimate pairing requires action by the account owner.
After the watch pairs
Before wiping the old iPhone, check:
- the watch unlocks with your passcode;
- recent Activity and workout data is present;
- Health data is visible on the new iPhone;
- notifications arrive as expected;
- the watch can communicate with the new iPhone;
- cellular service works, if applicable; and
- important apps and complications have restored correctly.
Only after these checks should you erase, trade in, or give away the old iPhone. If you are selling the watch itself, unpair it from the iPhone rather than simply erasing it so Activation Lock is removed for the next owner.
Frequently Asked Questions
Can I pair an old Apple Watch with a brand-new iPhone?
Usually, yes, if the exact Apple Watch model is compatible with the iPhone model and iOS version. Check Apple’s current compatibility requirements first; older watches have stricter software limits.
Do I need to erase my Apple Watch before pairing it with the new iPhone?
If it is still paired with the old iPhone, unpair it from the old iPhone’s Watch app. If the old iPhone is unavailable, erase the watch directly, but remember that direct erasure leaves Activation Lock enabled.
Will I lose my Apple Watch Health and Activity data?
Data included in a current iCloud backup or encrypted computer backup can be restored. Health data synchronized to iCloud can also appear on devices using the same Apple Account with Health enabled. Data that was never backed up or synchronized may not be recoverable.
What if I forgot the Apple Account password?
You must recover access to the Apple Account used to set up the watch. The password is required for unpairing, pairing in some situations, or removing Activation Lock.
Can I pair an Apple Watch without the old iPhone?
Yes. Erase the watch at Settings > General > Reset > Erase All Content and Settings, then pair it with the new iPhone. The original Apple Account credentials will still be required because direct erasure does not remove Activation Lock.
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The safest transfer is: check compatibility, update both devices, make a fresh backup with Health enabled, set up the new iPhone from that backup, and unpair the watch from the old iPhone if the new phone cannot detect the existing transfer. Keep the old iPhone until the watch and its important data are confirmed on the new one. If the old phone is unavailable, erase the watch directly—but expect Activation Lock and have the original Apple Account password ready.
