Set up One Number Wearable Plan

Learn how to activate One Number on your Apple Watch (GPS + Cellular).

To set up One Number, you'll need an iPhone 6s with iOS 13.3 or later, an eligible Primary Pay Monthly mobile plan and a compatible Apple Watch (GPS + Cellular) with watchOS 6.1.1 or later.

Topics on this page

• About One Number
• What you'll need
• How to activate plan: Bought online, in store or phone
• How to activate plan: Buy on the Watch app
• FAQ

Looking for troubleshooting? Go to Watch plan activation error messages

About One Number

One Number from Spark is a way to use your phone number on your phone and your cellular watch. Two devices, one number. You can also make and receive calls and SMS from your watch without being close to your phone.

You can get One Number when you sign up for a $7.00 One Number Wearable Plan ($6.09 excl. GST). It's a plan for cellular watches only. It lets you use the minutes and SMS from your primary Spark Pay Monthly mobile plan on your watch. Plus, you always get endless data on the watch. 

Note: Endless speeds reduce to 1.2 Mbps after max speed data allowance exceeded. No tethering or hotspots. You can only get SMS messages if your iPhone is turned on and connected to the network. 

What you'll need

To get One Number, first you'll need a smart watch and a phone. Check your device compatibility:

Compatible cellular watch

Apple Watch

• Apple Watch SE (2nd generation), Apple Watch Series 6 or later, Apple Watch Ultra, or Apple Watch Ultra 2 with watchOS 11 or later
• iPhone XS or later with iOS 18 or later

To check if there is a software update available, from your iPhone open the Watch app. Tap General > Software Update. You'll need watchOS 11 or later. Before installing an update, we recommend performing a backup. Download the update over WiFi to avoid using data.

You can also perform a software update from the watch: Learn how to perform a software update at https://support.apple.com/en-nz/watch

Note: The Spark network doesn't support models from the North American region. Learn more about bands, supported locations and carriers at apple.com/nz/watch/cellular

Samsung Watch

Samsung Galaxy Watch 5 4G/LTE and later (cellular models only that are on the latest software version)

To check for Galaxy Watch compatibility:

1. Swipe down from the top of the screen and select Settings
2. Select Software Update
3. Select Download and Install and follow the instructions
4. Repeat the above until the Watch updates to the latest version and ‘Your Watch is up to date’ is displayed on the screen

Make sure your Galaxy Watch has the latest versionsoftware version: 

1. Swipe down from the top of the screen and select Settings
2. Select About Watch
3. Select Software information
4. Tap Software version five times to enable developer mode. Check the last three letters of the software version ends in XNZ

Compatible phones

Apple iPhone

You'll need an iPhone XS or later. You'll need iOS 18 or later and VoLTE turned on in your settings.

Any beta versions or older, locked devices are currently not supported for One Number. Customers on beta software must wait for a beta update or the software update to 17.2 before being able to activate One Number. 

Here's how to install the latest software (iOS) from Apple:

1. On your iPhone, go to Settings > General > Software Update.
   • Before installing an update, we recommend backing up your phone. Download the update over WiFi to avoid using data.
2. Follow the prompts to update to the latest software version if required. 
   

Here's how to make sure VoLTE is turned on:

• No active eSIM: Go to Settings > Mobile > Mobile Data Options > Voice & Data. Choose 4G, VoLTE On.
• Active eSIM: Go to Settings > Mobile > Select SIM > Voice & Data. Choose 4G, VoLTE On.
  

Samsung

A Samsung Galaxy Watch will need a Samsung phone with Android 10 or later.

Here's how to install latest software on your Samsung phone:

1. Swipe down from top of the screen, and then tap the Settings icon
2. Select Software update, or System update (it will vary between models)
3. Tap on Download and Install, or Check for System updates, or Check for Software Updates (depending on your carrier)
4. When the download is complete, follow on-screen instructions to install the update

For details, refer to Samsung: How to update your Galaxy phone or tablet

Spark Pay Monthly or Business mobile plan

You'll also need a Spark Pay Monthly or Business mobile plan. Corporate accounts and users of Broadsoft, including IP Centrex and Mobile Office aren’t eligible for One Number at this stage. 

See all Pay Monthly plans

See all Spark Business mobile plans

Account authority for small business customers

Having trouble buying the One Number Wearable Plan? If you have an eligible Spark Business mobile plan, you might not have authority to make changes to your MySpark account.

This can happen when your account is managed by an administrator. We recommend reaching out to the acount holder to find a solution.

How does One Number work?

What you can do with your watch:

• Call, text and use data 
• Sync contacts from your phone 
• Make emergency call to 111 
• Use call forwarding and voicemail Roam overseas (limited functionality)  
• Receive emergency mobile alerts

Roaming capability is limited to: 

Apple 

Calls - Cannot be made or received when roaming. The watch can still be connected via Bluetooth when in range or through WiFi if available, however the primary phone must be in range.  

SMS - Are able to be sent and received if the primary phone is on and the the watch has a cellular connection to the roaming network or is connected to the primary phone via Bluetooth.

Data - Can be used roaming on a 4G network only, but not when roaming in the USA.  

Samsung 

Calls - Are able to be made and received, but only on 3G network and not when roaming in the USA.

SMS - Are able to be sent and received if the primary phone is on and the watch has a cellular connection to the roaming network or is connected to the primary phone via Bluetooth.

Data - Can be used roaming on 3G and 4G network only, but not when roaming in the USA.

What you're unable to do on your watch:

• Hotspot or tether 
• Send/receive TXT message via default messaging app if the primary phone isn’t switched on.

Other things to note: 

• Apple watch does not support 4G to 3G handover, so calls will be dropped when moving from a 4G to 3G cellular network and vice versa.
• With Apple Watch you can have one call on your phone, and a different call on your watch if both devices are

How to activate One Number Wearable Plan

Find out how to set up the $7.00 One Number Wearable Plan from Spark.

If you still need to purchase a plan, Go to Buy on the watch app

Already bought the plan from us?

Apple devices

Ensure that your iPhone and Apple Watch are paired via Bluetooth before starting. See apple.com for instructions: Set up and pair your Apple Watch with iPhone

Follow these steps to activate One Number Wearable Plan:

1. Make sure Bluetooth is turned on for the iPhone and the Apple Watch.
2. Open the Watch app on your iPhone, then tap Pair New Watch and follow the prompts
   • If your watch is already paired, don't tap Pair New Watch. Instead, go to step 4.
3. During pairing, skip Mobile Set-up. Select Skip This Step for now.
4. Once your watch is paired, in the Watch app select Mobile.
5. Select Set Up Mobile.



6. You'll see a spinning wheel. Wait 5–7 minutes for the spinning wheel to stop. You might still see the option to Set Up Mobile, but you don't need to do anything.



7. Once your plan is active, you'll get a text message from Spark to let you know that One Number is ready to use.

If you've followed these steps but you still can’t see Spark NZ, or you get an error message, do not choose Set Up Mobile or Add a New Mobile Plan again. Instead, turn Airplane mode on then off again, or try restarting the phone. Once you've restarted your phone, you can open the Watch app again.

Android devices

Make sure that your Samsung phone is connected to the Spark network and that your phone and watch are paired via Bluetooth before starting.

See samsung.com for instructions: How to connect Galaxy watch with Samsung mobile phones?

Then follow these steps to activate your One Number Wearable Plan:

1. Before starting, download the Galaxy Wearable app, if it's not already installed on your phone.
2. Open the Galaxy Wearable app on your phone
3. Tap Watch Settings and then Mobile plans
4. Tap Next on the Set up a mobile plan screen and follow the prompts on the screen to complete setup
5. The screen will show setting up mobile plan, you will be prompted if you want to use your Spark plan
6. Tap Use Plan
7. Once set up is complete, the screen will show Welcome to Spark. Tap Done.

You will receive a text confirming your One Number is active.

You may refer to your device's user guide for support. See device support user guides

Buy the One Number Wearable Plan from your watch app

We recommend buying the plan from the watch app on your primary phone. See the instructions below.

1. Make sure Bluetooth is enabled on the primary phone and the smart watch.
2. Open the watch app on your primary phone, then tap Pair New Watch and follow the prompts.
3. During pairing, skip Mobile Set-up. Select Skip This Step for now.
4. Select Mobile, then Set Up Mobile.

3. You'll see the Spark sign in page.

4. Enter your email address and password, then select Continue.
5. Review the information about the $7.00 One Number Wearable Plan, then select Continue.
6. Read the terms and conditions and tick I agree to the above Terms and Conditions., then select Accept.
   
7. Review plan details, including your primary line, and select Sign up.
   
8. You'll see a success screen. Select Close.
9. Wait 5–7 minutes for your plan to be activated. You may still see the option to Set Up Mobile, but you don't need to do anything. 

Once your plan is active, you'll get a text message from Spark to let you know that One Number is ready to use.

Frequently asked questions (FAQs)

Get answers to common questions about Spark's One Number Wearable Plan.

Related articles:

• One Number activation error messages
• Set up eSIM devices
• Understand dual SIM