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  1. NumberSync for Compatible Apple Devices: Available for voice calls only. Requires iPhone 6 or newer model running iOS 9.3 or later on an AT&T postpaid wireless account and with AT&T Wi-Fi Calling enabled. For Wi-Fi Calling set-up and restrictions, check out att.com/wificalling. Device Limit: Sync up to 5 devices.

    Voice charges: Calls to international numbers using NumberSync are subject to international rates consistent with your smartphones plan or international option. See here for information on pay-per-use rates and available packages for international calls from the U.S. and for roaming when traveling abroad. 

    Data charges: When your secondary device isn’t connected to Wi-Fi, calls sent or received using NumberSync count as data, and data usage rates will apply —this includes standard data rates in the U.S., Puerto Rico, and the U.S. Virgin Islands, and international roaming data rates when traveling abroad. 911 Calls. If you can’t be located using location information obtained from your device, 911 calls will be routed based on the address you provide in the NumberSync settings of your device. 911 calls aren’t supported outside the US, Puerto Rico, or USVI. 

    911 calling with TTY and Real-Time Text: Due to technical limitations, NumberSync can’t be used with TTY devices or support 911 calls over TTY devices. Persons with communications disabilities can use Real Time Text (www.att.com/RTT) as an alternative. 911 services can be reached by either: (1) calling 911 using Real Time Text, or (2) calling 911 directly using a TTY over the cellular network or from a landline telephone, or (3) sending a text message to 911 directly (in areas where text-to-911 is available) from a wireless device, or (4) using relay services to place a TTY or captioned telephone service (CTS) call from a wireless phone over the cellular network or from a landline telephone, or (5) using relay services to place a IP Relay or IP CTS call over a cellular data or other IP network. 

    Additional restrictions: NumberSync can’t be used to initiate calls to 211, 311, 511, or 811. It isn’t compatible with Smart Limits, Ringback Tones, OfficeDirect, or OfficeReach. Real Time Text isn’t supported on all secondary devices like wearables and computers. Go to www.att.com/RTT for more information on how to use Real Time Text. Additional Information: See the FAQ above.

  2. Apple Watch: Your Apple Watch will only work as a secondary device if you’ve used it in the same Wi-Fi location previously, while using your iPhone to connect it. If you leave your iPhone at home and go to a new location the Apple Watch won’t be able to connect to the Wi-Fi network. You won’t be able to make and receive calls at the new location.