eSIM in Apple Watch: Everything You Need to Know and How to Set It Up

What Exactly Is eSIM and Why Does It Matter for Apple Watch?

An eSIM, or embedded SIM, is a digital version of a traditional SIM card that's built into your device. Unlike physical SIMs, there's no need to insert or remove anything—everything is managed digitally.

On Apple Watch, eSIM is what enables certain models (specifically the cellular versions) to connect to mobile networks without needing to be near your iPhone. Without it, a non-cellular Apple Watch relies on Bluetooth or Wi-Fi to sync with your phone for calls, messages, and data access.

Experience Seamless Connectivity

For active users, eSIM offers real convenience. Whether you're running, hiking, or just stepping away from your phone, you stay connected right from your wrist.

With a cellular Apple Watch and an activated eSIM plan, you can:

• Make and receive calls directly on your watch
• Send and get messages without your phone nearby
• Stream music and podcasts on the go
• Use data-powered apps for weather, maps, fitness, and more
• Get notifications in real time

This kind of standalone connectivity gives you the freedom to leave your phone behind—without losing touch.

Top Benefits of eSIM for Your Apple Watch

Choosing an Apple Watch with eSIM unlocks several practical advantages:

• More Freedom, More Flexibility

Your watch becomes a fully functional device on its own. Make calls, send texts, or go online without your phone.

• Stay Safer with Built-In Backup

In case of emergencies, even if you’re without your phone, your watch can still contact help, receive alerts, and share your location.

• Ideal for Fitness and Outdoor Use

Go for a workout or adventure without your phone. You’ll still get notifications, track progress, and enjoy music—all with a reliable cellular connection.

Stay Connected Wherever You Go

The eSIM in your Apple Watch integrates easily with your existing mobile plan. Most carriers let you add the watch as an extra device, sharing the same number as your iPhone.

Whether you're swimming (on compatible models), exploring off the grid, or just enjoying the simplicity of wearing less, eSIM ensures you’re still connected. It keeps your Apple Watch versatile, reliable, and ready for whatever your day holds.

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What Do You Need to Start Setting Up an eSIM on Apple Watch?

Before activating eSIM on your Apple Watch, make sure you have the following essentials ready:

• An iPhone XS or newer with the latest iOS version installed
• An Apple Watch model that supports eSIM, such as: Apple Watch Series 3 or later, Apple Watch Ultra LTD, Apple Watch Ultra 2, Apple Watch SE
• A mobile carrier that supports eSIM functionality for Apple Watch

Having all these in place ensures a smooth setup process and seamless connectivity.

How to Set Up an eSIM on Apple Watch

Once your iPhone and Apple Watch are ready and your carrier supports eSIM, you can start the setup process. For an even smoother experience, BitJoy offers Apple Watch-compatible eSIMs with fast and easy activation—no delays, no hassle.

Follow these steps to get your Apple Watch connected:

Step 1: Pair Apple Watch to iPhone

Even though cellular Apple Watches can work independently, you must pair them with an iPhone during the initial setup. Here's how:

• Put your Apple Watch on and turn it on.
• Hold it close to your iPhone until the setup screen appears. Tap Continue.
• Choose Set Up for Myself or Set Up for a Family Member.
• Position the watch in front of your iPhone camera to complete the pairing.
• Choose Set Up as New or Make This Your New Apple Watch if you're upgrading.
• Sign in with your Apple ID.
• Create a passcode if you plan to use Apple Pay.
• Adjust settings like text size and share health data to personalize the experience.

For full setup details, you can refer to Apple’s official support page.

Step 2: Check Apple Watch Compatibility

Only certain models support eSIM. You’ll need:

• Apple Watch Series 3 (GPS + Cellular) or newer
• iPhone running iOS 14 or later

Make sure both devices are updated to the latest software versions.

Step 3: Check With Your Carrier

Not all carriers support eSIM for Apple Watch, so it’s important to check with your provider first. Most major networks offer support, but plan availability and pricing can vary.

Step 4: Add a Cellular Plan to Your Apple Watch

Once pairing is complete, follow these steps to activate eSIM:

• Open the Apple Watch app on your iPhone.
• Go to the My Watch tab, then tap Cellular.
• Tap Set Up Cellular. Follow the on-screen instructions.
• Sign in with your carrier account details.
• Review and agree to the Terms and Conditions.
• Your carrier will download the eSIM profile to your Apple Watch.
• Wait for confirmation—this can come via SMS or a notification.
• Once setup is complete, you'll see your plan listed in the Cellular settings.

If successful, your Apple Watch will show a 4G or 5G signal icon. It can now make calls, send messages, and use data—completely untethered from your iPhone.

Step 5: Change the Network Provider on Your Apple Watch (if needed)

If you're switching carriers or using a travel eSIM, you can update the network manually:

• Connect your iPhone to the new network.
• Open the Apple Watch app.
• Tap Cellular in the My Watch tab.
• Your Apple Watch will automatically switch to match your iPhone’s network.

Apple Watch GPS vs GPS + Cellular: What's the Difference?

Newer Apple Watch models typically come in two versions: GPS and GPS + Cellular. The main difference is connectivity. A GPS-only Apple Watch needs to be near your iPhone to access calls, messages, and data. In contrast, GPS + Cellular models can connect directly to mobile networks—allowing you to make calls, send texts, and use apps even when your iPhone isn’t with you.

Both models follow the same eSIM setup process, so there's no added complexity based on the version you choose.

Using a Dual SIM on Your Apple Watch

If you prefer not to share the same SIM or eSIM between your iPhone and Apple Watch, you can add multiple cellular plans directly to your watch. Just follow the same setup steps mentioned earlier. This setup allows you to use one plan on your phone and a different plan on your watch—giving each device its own connection.

If one of your plans runs out of data, minutes, or texts, you can easily switch back to using a single shared plan between both devices until your limits reset or you recharge your plan. This flexibility gives you more control over how your Apple Watch connects—whether for personal use, travel, or managing separate work and personal numbers.

Things to Keep in Mind When Using eSIM on Apple Watch

Before or after setting up your Apple Watch with an eSIM, here are a few key points to remember:

• Your Apple Watch acts as a phone companion: It can make calls, send messages, and use data, but it still needs to be paired with an iPhone to access its full functionality.
• Device compatibility is essential: Not all iPhones work with all Apple Watch models. Make sure your iPhone and Apple Watch are both compatible with eSIM technology before starting setup. 
• Only one number can be active at a time: Although your Apple Watch can store multiple mobile plans, it can only use one phone number at a time for calls and texts.
• Data usage is tied to your cellular plan: Any internet activity on your Apple Watch is billed to the active data plan it’s connected to—typically the same plan as your iPhone unless you’ve set up a separate one.

What Does an eSIM Cost and How Much Data Does It Use?

Using an eSIM on your Apple Watch adds flexibility but may come with additional charges.

• Monthly plan costs: Most carriers offer Apple Watch eSIM plans as an add-on, typically ranging from $5 to $15 per month.
• Shared data allowance: Any data used on your Apple Watch is counted toward your phone’s total data plan with your carrier.

In terms of usage, tasks like music streaming or using GPS apps consume more data than simple notifications or messages. It’s a good idea to monitor your data usage early on to understand how much your watch typically uses. This helps avoid unexpected charges and ensures you stay within your plan limits.

FAQs About eSIM in Apple Watch

Got questions about how eSIM works on Apple Watch? Below are clear answers to the most common things users want to know.

Can I use my eSIM-enabled Apple Watch in any country?

eSIM support for Apple Watch is available in many regions, but coverage varies by carrier and country. Before traveling, check with local providers to confirm smartwatch eSIM compatibility.

Will my Apple Watch have a separate phone number?

No. Your Apple Watch shares the same phone number as your iPhone. This keeps communication simple and avoids managing multiple numbers.

Is data secure when using an eSIM on Apple Watch?

Yes. eSIMs are built with strong security standards. Data transmitted over the network is encrypted and protected, just like with a physical SIM.

Can I use an Apple Watch eSIM without an iPhone?

Yes, but only after setup. GPS + Cellular models can function independently once the eSIM is activated via a paired iPhone. After that, the watch can stay connected on its own.

Final Thoughts: Is eSIM on Apple Watch Worth It?

If you want to untether your Apple Watch from your iPhone and enjoy full mobile access on the go, using an eSIM is a smart choice. It’s ideal for staying connected during workouts, outdoor activities, or times when carrying a phone isn’t practical. You can make calls, send messages, and use apps—all from your wrist.

Read more:

Why You Should Use an eSIM for Stress-Free Global Travel

SIM vs. Nano SIM vs. eSIM: Understand the Differences

Just check that your mobile carrier supports eSIM for smartwatches. Also, expect a small monthly fee to activate the service. For users seeking convenience, added safety, or true mobility, the eSIM powered by BitJoy unlocks a new level of freedom with the Apple Watch.