Information about Apple Watch Series 3 Activation and Plans



  • Apple Watch Series 3
  • iPhone 6 or later running iOS 11 or later
  • A T-Mobile ONE plan
  • You own the account or have rights to add new lines to the account
  • Customers on Business or Special account types will need to contact a T-Mobile Account representative to activate your new rate plan


How to activate cellular service on Apple Watch Series 3
Good news - your iPhone and Apple Watch Series 3 will share the same phone number. So you won’t have to get or remember another phone number.

Apple Watch Series 3 has an eSIM (embedded SIM) in it so there’s no need to get a SIM card or transfer the SIM from another device.

When you pair your Apple Watch to your iPhone, you will be prompted to set up cellular service and guided through a few simple steps.

To set up a new line of service directly from your iPhone, you’ll need to be on a consumer account and will need to verify the credential of the account owner.

If you don’t see a plan during set up, contact us and we can help you find one that works for you.

If you choose not to set up cellular service during the initial Apple Watch set up process, you can always go back later to the Apple Watch app on your iPhone and select Cellular under My Watch to sign up.

Eligible iPhone plans
The Apple Watch works with our T-Mobile ONE plans.

Wireless network support
Apple Watch seamlessly connects to the cellular network whenever it’s not connected to a nearby iPhone or Wi-Fi access point.

Apple Watch Series 3 supports voice and data over LTE [and UMTS]. [CDMA is not supported.]

Roaming outside your provider network coverage area is not available for Apple Watch Series 3 even though your iPhone plan may support roaming. However, you will continue to be connected when your Apple Watch is in proximity of your iPhone or connected to Wi-Fi.

Learn more about Apple Watch at Visit for additional support.