NumberSync for Apple Watch (Cellular) overview

Learn how to use your Apple Watch Series 3 or Series 4 (GPS + Cellular) on our domestic wireless network with NumberSync for Apple Watch (Cellular).

About NumberSync

With NumberSyncSM for Compatible Apple Watch (Cellular)1, you can sync your Series 3 or Series 4 (GPS + Cellular) Apple Watch with your iPhone and wireless number. Once your watch is set up with NumberSync, you can talk, text, and use cellular data on your watch on our domestic network. That includes the U.S., Puerto Rico, and the U.S. Virgin Islands.

Learn how to set up NumberSync for Apple Watch (Cellular)

Voice and data usage

The Apple Watch Series 3 and Series 4 (GPS + Cellular) connect for talk and data in 3 ways: 
  • Bluetooth® - The Apple Watch uses Bluetooth to communicate with your iPhone. When you make or receive a call on the watch, your iPhone makes or receives the call but relays it to the watch – similar to what happens with a Bluetooth headset. The watch uses the same data network as the iPhone it’s paired to.
  • Wi-Fi connection® - If you’re outside Bluetooth range, the watch connects to known Wi-Fi networks for calls, messages, and data. It learns how to connect to Wi-Fi through the iPhone. The watch only connects to networks the iPhone has previously connected to and remembered.
  • Wireless - When the watch isn't in the range of Bluetooth or Wi-Fi, it connects to our cellular network for talk and data service. 


Want to get text messages and iMessages on your watch? Make sure your iPhone is powered on and the following are enabled:
  • iMessages 
  • NumberSync, so you can access our wireless network to get messages on your watch when you're away from your iPhone
  • A connection to our cellular network or to Wi-Fi (with Wi-Fi Calling)

Out -of -network and international calls

In the U.S. - outside our network 
Apple Watch (Cellular) doesn't support calls outside our coverage area.

In the U.S. - international dialing
We support international long-distance calling from the U.S. over our mobile network and through Wi-Fi. Rates are based on the plan you have for your Apple Watch Series 3 or Series 4 (GPS + Cellular). You can find current rates and available international options at

Here's how we charge calls to international numbers when you use our mobile network or Wi-Fi:
  • If you have an international long-distance package and you call a country in that plan, those rates apply.
  • Have a domestic wireless plan with a reduced international calling rate? If you call a country covered by your plan, those rates apply. 
  • Otherwise, we charge pay-per-use rates for international long distance.
  • International long-distance calls made over Wi-Fi are billed like calls made in the U.S.

Outside the U.S.
  • Calls on the watch when traveling abroad is supported.
  • Calls using Wi-Fi are billed to your watch plan.
  • Calls using Bluetooth are billed to your iPhone plan.


Answer or make calls from your watch usingAccess data from your watch using yourWhich plan will be billed
BluetoothiPhone with BluetoothiPhone
Wi-Fi or our wireless networkApple Watch Watch

See all important details
Last updated: February 16, 2023

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