About NumberSync

NumberSync provides the ability to sync your iPhone mobile number with other Apple devices. You can make and receive phone calls from those devices using your mobile number. For example, if your iPad is synched you can place or receive a call from the iPad, even if your iPhone is turned off or in another location. You can sync up to five compatible Apple devices with your Wi-Fi Calling enabled iPhone.

Your NumberSync device must have access to an Internet connection. This can be over Wi-Fi, wired broadband, or mobile broadband. If you use a Wi-Fi connection and go out of range or the connection is lost, the call will drop.

Billing for NumberSync
NumberSync billing is based on the number being called.

Domestic calls
NumberSync calls are not billed voice airtime or usage charges when calling to the U.S., Puerto Rico, or U.S.V.I. This applies even if you're traveling abroad and call a U.S. number.

International long distance calls
NumberSync calls to international numbers will be billed international long distance rates based on your smartphone plan or international long distance package. This applies no matter where the call is made from. For example, if you’re traveling abroad and call the restaurant across the street from your hotel, the call will be billed.

NumberSync over mobile broadband
When you use mobile broadband, NumberSync calls made and received count as data and incur data usage rates. This applies if you're calling from the U.S., Puerto Rico, U.S.V.I., or traveling abroad.  This includes standard data rates in the U.S. and international roaming data rates when traveling abroad. 

Note: If the secondary device is billed to a non-AT&T wireless carrier, the following applies:

• Mobile data: Usage and charges will be based on your data plan with the other carrier. International mobile data usage rates will be based on the rates determined by that carrier. Applicable usage and charges will appear on the other carrier’s bill, not your AT&T bill.
• Voice: Usage will be the same as using an AT&T sold secondary device. Applicable international long distance or premium (411) charges will appear your AT&T bill.

Limitations
NumberSync doesn’t support calls to:

• 211
• 311
• 511
• 811

You cannot use NumberSync in these countries:

• China
• Cuba
• Democratic People’s Republic of Korea
• India
• Iran
• Israel
• Pakistan
• Saudi Arabia
• Sudan
• Syrian Arab Republic
• Turkey
• United Arab Emirates
• Vietnam

Bill presentation
A summary of calls will be included in the Voice Usage Summary section of your bill. The call detail section of your bill will provide a rate code for each call:

• WIFI - Indicates Wi-Fi calls from your iPhone primary device
• NBSC - Indicates NumberSync calls from secondary devices

¹NumberSync for Compatible Apple Devices: Available for voice calls only. Requires iPhone 6, 6 Plus or newer model running iOS 9.3 or later on AT&T postpaid wireless account & with AT&T Wi-Fi Calling enabled. For Wi-Fi Calling set-up & restrictions, visit 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 smartphone’s rate plan or international package. See www.att.com/international 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 secondary device is not connected to Wi-Fi, calls sent/received using NumberSync count as data, & data usage rates will apply—this includes standard data rates in the US, Puerto Rico and USVI and international roaming data rates when traveling abroad. Service Limitations: Due to technical limitations, calls via NumberSync cannot be used with TTY devices or to initiate calls to 211, 311, 511, or 811.  NumberSync will not support 911 TTY calls. Instead, dial 911 with a TTY from a wireless phone on a cellular network or landline phone; or text 911 directly, where available; or call 911 through relay service using TTY or IP CTS from a wireless phone on a cellular network or landline phone; or use IP Relay or IP CTS from a capable device. 911 Calls: If you cannot 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 are not supported outside the US, Puerto Rico, or USVI.  Additional restrictions: Not compatible with Smart Limits, Ringback Tones, OfficeDirect, or OfficeReach. Additional Information: See FAQs.