Learn how to use one smartphone number across multiple devices to send and receive texts, make and receive calls, and more.


In this tutorial, you will learn how to:

• Log in to NumberSync
• Log out of NumberSync

With AT&T NumberSync™, once you sync devices to your smartphone number, you can make and receive voice or video calls from whatever device you choose. Video calls require an AT&T Video Call-capable smartphone. Your smartphone number will display on the call recipients caller ID. Certain restrictions, requirements or limitations may apply. Visit NumberSync Support or for more details.

Log in to NumberSync

1. From the home screen, select the phone Phone app

Note: Visit Learn how to use NumberSync for Android tablets for more information.

2. Review the AT&T NumberSync prompt, then select OK.

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3. Enter your myAT&T User ID and Password for the smartphone number you would like to sync with your tablet, then select Continue.

Note: A text message will be sent to the number linked with your User ID. Reply with the provided code word to complete the log in process. Upon first log in you will be prompted with a TTY notice. Select Next to continue. 

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4. Select the desired emergency address then select Next, or select Add new address and follow the prompts. 

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5. Enter a device name, then select Done

Note: For information on how to make and receive calls from your tablet, see the Call Features.

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Log out from NumberSync

1. From the home screen, swipe down from the Notification bar then select the  Settings icon. Scroll to and select Accounts and backup

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2. Select Manage accounts

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3. Select AT&T NumberSync

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4. Select Log out.

Note: Select OK to confirm. 

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NumberSync for Android tablets requires smartphone set up for HD voice on AT&T postpaid wireless account & compatible tablet. To use NumberSync for video calls on tablet, phone must be video call capable. 

Device Limit: Sync up to 5 tablets.

Charges: When tablet not connected to Wi-Fi, data usage rates apply to voice & video calls on tablet. International calls sent on tablet incur charges consistent with phone’s rate plan or international package.

Roaming: Cannot use NumberSync outside US, PR, or USVI.  

Calls via NumberSync cannot be used with TTY & will not support 911 TTY calls. Visit for more information about 911 services, TTY, and progress with RTT. 

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