Apple Watch uses eSIM technology to provide cellular connectivity independent of your iPhone. When set up with a cellular plan, your Watch can make calls, send messages, stream Apple Music, use Maps, and access any app that supports cellular on watchOS. The Watch shares your iPhone's phone number, so callers do not need a separate number to reach you on your Watch.
This guide covers the complete setup process and travel considerations.
Step-by-step instructions
- 1
Verify your Watch model supports cellular
Only Apple Watch GPS + Cellular models include eSIM hardware. Open the Watch app on your iPhone and go to General > About. The model name should include 'GPS + Cellular.' Compatible models include Apple Watch Series 3 (GPS + Cellular) through the latest Series 10 and Apple Watch Ultra 2.
GPS-only models cannot use eSIM regardless of software updates. You can also identify the cellular model by a red circle on the Digital Crown (Series 3 and 4) or a red accent on the side button (Series 5 and later).
Tip: The model number on the back of the Watch or in the Watch app's About screen definitively identifies whether it is GPS-only or GPS + Cellular.
- 2
Set up the cellular plan through the Watch app
Open the Watch app on your iPhone. Tap 'Cellular' (or 'Mobile Data' in some regions). Tap 'Set Up Cellular.' Your carrier's setup page loads within the Watch app.
Follow the carrier-specific prompts, which may include signing into your carrier account and agreeing to terms. The carrier provisions a companion eSIM that links to your iPhone's phone number. Setup takes 5 to 10 minutes depending on the carrier.
Monthly costs range from $5 to $15 depending on your carrier and plan.
Tip: Your iPhone and Apple Watch must be on the same carrier. You cannot use a T-Mobile iPhone with a Verizon cellular Watch plan.
- 3
Test cellular connectivity
Leave your iPhone at home and walk outside with just your Watch. The cellular icon (green dot at the top of the watch face or in Control Center) should appear, indicating the Watch is connected to the cellular network. Make a test call or send a message to verify.
Open Apple Music or a podcast app to confirm data streaming works. If the green cellular dot does not appear, restart your Watch and check the cellular settings in the Watch app on your iPhone.
Tip: The Watch uses Wi-Fi first when available, then cellular. To test the cellular connection specifically, turn off Wi-Fi on the Watch via Control Center.
Frequently asked questions
Can I use a travel eSIM on my Apple Watch?
Apple Watch does not support third-party travel eSIM profiles. The Watch eSIM only works with your carrier's companion plan that mirrors your iPhone's number. When traveling abroad, your Watch's cellular uses international roaming through your home carrier, which may incur roaming charges. Some carriers include Watch roaming in their international plans.
Does Apple Watch cellular work in other countries?
Apple Watch cellular works internationally if your carrier supports international roaming for Apple Watch. AT&T, T-Mobile, Verizon, EE, and Vodafone support Watch roaming in select countries. Check your carrier's coverage map for Apple Watch international roaming availability. The Watch must be on the same cellular band as the destination country's network.
How much data does Apple Watch use?
Apple Watch uses approximately 50 to 100MB per day with normal use (notifications, messages, short calls). Streaming Apple Music uses about 30MB per hour. Background sync (health data, weather updates) uses about 20MB per day. The Watch is designed for lightweight cellular use and conserves data automatically by limiting background refresh when on cellular.
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