<p>Download the free ActiveArmor app to: </p><ul><li>Help block spam and fraud calls</li><li>Secure your device and the stuff on it</li><li>Get notified of data breaches</li></ul>

Get the AT&T ActiveArmor app

Get smartphone, tablet & mobile device support from AT&T. Select the brand of your phone, table, or mobile device from the list of popular brands.

AT&T Device Support – Select a Phone, Tablet, or Device Brand

AT&T Device, Phone & Tablet Support – AT&T Official Site

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Here's your device's complete instructions, specs and more.

User manual

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Device Help & How-To Guides - AT&T

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View the device phone, serial, and IMEI number. 

Find IMEI, Phone & Serial Number

Access Usage Manager to view data usage, set data limits, and see the apps using the most data.

View & Manage Data

Determine your current device software version and check for updates.

Software Version

Learn how to update the software of the AT&amp;T Global Modem (USB800).

Software update for the AT&T Global Modem (USB800)

View cellular network signal, turn cellular data connection, international roaming, and mobile data connection on or off.

Signal & Cellular Data

Use hotspots, connect to Wi-Fi, turn data on or off, and more.

Determine your device&#39;s SIM card type, operating frequencies, and physical characteristics.

Specifications

Get tips on the best way to keep your device clean.

Learn How to Clean Your Device

This article describes how to connect to the AT&amp;T Network.

Connect to AT&T Network

Set up your device for the first time or after a factory reset.

Device Setup

View network information, messages, and device information in the management website. 

Management Website

Security

Learn how to find your device and secure your info.

Modem & Router Settings

View Messages & Notifications

Check your battery life, adjust sound, set up alerts, and more.

Update device software, check data use, and manage device memory with ease.

This article provides an overview of the LED states.

LED States

Troubleshoot limited or no connectivity on your device. 

Limited or No Connectivity

Perform a factory reset to restore default settings on the device. Perform a factory reset if you have been locked out of access to your device settings.

Reset Device

Explore ways to resolve device issues or reset your device.

Device help

Having device issues?