Device help

Get step-by-step help and info for your device.

Access Downloaded Files

Learn how to access files downloaded from a web browser, email, and messages.

Browse the Web

Access the web, access or edit bookmarks, access tabs, and access browser settings.

Download Apps & Games

Download apps, games, movies, music, books, magazines, newspapers and more.

Back up & Restore with Google

Discover how to use Google to back up contacts, photos, and files.

AT&T Personal Cloud

Use AT&T Personal Cloud to back up and sync your contacts, photos, videos, and more from your device to the cloud.

Available Storage

Learn how to check available device storage, free up memory, remove unused apps, or clear app data.

Back up & Restore with a Computer

Learn how to back up and restore your device using a computer.

Back Up & Restore with Memory Card

Find out how back up contacts, photos, and files with a memory card to increase device memory or transfer to another device.

Back up & Restore with Google

Discover how to use Google to back up contacts, photos, and files.

Back up & Restore with Google

Discover how use Google to back up contacts, photos, and files.

Airplane Mode

Learn how to turn Airplane Mode on and off using the Notification bar or through Settings.

Optimize Battery Life

Tips and tricks to extend your battery performance.

Display

Change the display brightness, time out and orientation.

Block or Unblock Calls

Block or unblock calls from your device. Block unknown calls.

Call Features

Get familiar with in-call options, including muting and speakerphone, as well as advanced call features, such as creating a conference call.

Call Forwarding

Manage call forwarding from your device.

Contacts

Learn how to add, view, delete, customize by adding a picture or ringtone, and backup your contacts.

Make & Receive an AT&T Video Call

AT&T Video Call lets you make and receive HD Voice calls combined with real-time video.

Wi-Fi Calling

Use your Wi-Fi connection to talk and text when cellular coverage is limited or unavailable.

Airplane Mode

Learn how to turn Airplane Mode on and off using the Notification bar or through Settings.

Bluetooth

Learn how to turn Bluetooth on or off, scan and connect to other Bluetooth devices, and unpair a connected device.

Mobile Hotspot

Learn how to set up your device as a personal hotspot and share your data connection with Wi-Fi-capable devices.

Signal & Cellular Data

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

Wi-Fi

Learn how to turn Wi-Fi on or off, connect to a Wi-Fi network, and remove a Wi-Fi network.

Specifications

Determine your device's SIM card type, operating frequencies, physical characteristics, storage, and more.

Learn How to Clean Your Device

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

Device Setup

Set up your device for the first time or after a factory reset and use Setup & Transfer.

Find IMEI, Phone & Serial Number

Learn how to locate your device's IMEI, serial number, and phone number.

Gestures & Motion

Learn how to use air gestures and motions as well as access additional motions and gestures.

Google Sign-In

Add your Google account to sync Gmail, Chrome, YouTube, Google Maps, and more.

Insert SIM & Memory Card

Learn how to install a SIM or memory card for your device.

Keyboard & Typing

Learn how to access keyboard settings, use Swype, auto-complete suggestions, emojis, speech-to-text, and one-handed operation.

Learn & Customize the Home Screen

Make changes to apps, widgets, folders, wallpapers, home screen panels, and screen grid.

Block or Unblock Messages

Learn how to block and unblock messages.

Contacts

Learn how to add, view, delete, customize by adding a picture or ringtone, and backup your contacts.

Email Settings

Learn how to manage email settings such as sync frequency, server settings, signature, removing an email account, and more.

Messaging Settings

Manage messaging settings such as notification alerts, Advanced Messaging, message limits, restore default settings, and emergency/AMBER alert settings.

Send & Receive Email

Add and download email attachments, respond to an email and more.

Send & Receive Messages

Create and respond to text (SMS), Advanced Messaging, or picture (MMS) messages, add, save, and view received attachments and more.

Set Up Email

Learn how to add your email accounts so you can read and send email on your device.

AT&T Personal Cloud

Use AT&T Personal Cloud to back up and sync your contacts, photos, videos, and more from your device to the cloud.

Back up & Restore with Google

Discover how to use Google to back up contacts, photos, and files.

Back up & Restore with a Computer

Learn how to back up and restore your device using a computer.

myAT&T

View and pay your AT&T bills online, manage your account, reset passwords, or upgrade your AT&T services.

QSlide

Learn how to multitask efficiently with additional windows over your main screen with QSlide.

QuickMemo+

Create memos with text, drawings, images, video and more using QuickMemo+.

Browse the Web

Access the web, access or edit bookmarks, access tabs, and access browser settings.

Calendar

Access the calendar on your device and learn how to manage events.

DTS:X 3D Surround

Listen to music and audio in immersive 3D sound that is balanced in a selected direction.

Dual Window

Learn how to use Dual Window, which allows you to have two apps open at the same time.

EasyHome

Learn about EasyHome, which provides a simpler smartphone home screen experience.

Google Assistant

Learn how Google Assistant allows you to control your device and access voice control settings using voice commands.

Access, Store Photos & Videos

Learn how to access and store your photos and videos.

Advanced Photo & Video Features

Learn how to access and use Camera modes, effects, customization, and crop a photo.

AT&T Personal Cloud

Use AT&T Personal Cloud to back up and sync your contacts, photos, videos, and more from your device to the cloud.

Camera & Video Settings

Manage camera and video settings including picture size, timer, voice control, and flash.

Camera Modes

Learn what camera modes are available on your device and what each mode does.

Take a Picture

Learn how to access the camera, take a picture, switch between front and rear facing camera, and more.

Take a Screenshot

Learn how to take and access screenshots.

Take a Video

Learn how to record a video, capture images during video recording, and more.

Transfer Photos & Videos

Learn how to transfer photos and videos to or from your device and a computer.

Ads, Pop-ups & Notifications

Free apps typically get revenue through ads, pop-ups, or notifications. Learn how to manage these on your device.

Anti-Theft

Learn how you can help protect your phone from unauthorized use if it has been lost, stolen, or reset to factory settings without your permission.

Secure My Device

Learn how to lock or unlock your display, set a screen security lock type (intelligent scan, face, iris, fingerprint, pin, password, pattern, or swipe), get your PUK code, or request your device be unlocked from the AT&T network.

Viruses & Malware

Learn how to determine if you might have harmful software (malware) on your device and get tips to help fix the issue.

Accessibility

Accessibility features improve the usability of your device for users with impaired vision or hearing, cognitive difficulty, or reduced dexterity.

Date, Time & Alarm

Learn how to set the date and time on your device as well as use the alarm clock.

Display

Change the display brightness, time out and orientation.

EasyHome

Learn about EasyHome, which provides a simpler smartphone home screen experience.

Notifications & Alerts

Learn how to access and adjust notification settings, turn notifications on or off, and more.

Sounds

Change volume settings, ringtones, notification alerts, and use Do not disturb mode.

Available Storage

Learn how to check available device storage, free up memory, remove unused apps, or clear app data.

Find IMEI, Phone & Serial Number

Learn how to locate your device's IMEI, serial number, and phone number.

Reset Device

Learn how to perform a soft, factory, or alternate master reset of your device.

Safe Mode

Android phones have a feature called Safe Mode, which can help you rule out problematic apps as the cause of your device problems.

Software update for the LG K40 (LMX420AS)

Learn how to update the software of the LG K40 (LMX420AS).

Software Version

Determine your current device software version and check for updates.

View & Manage Data

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

Ads, Pop-ups & Notifications

Free apps typically get revenue through ads, pop-ups, or notifications. Learn how to manage these on your device.

App Troubleshooting

Learn how to troubleshoot apps by clearing the app cache, force stopping an app, checking for updates, removing an app, and reinstalling.

Reset Device

Learn how to perform a soft, factory, or alternate master reset of your device.

Safe Mode

Android phones have a feature called Safe Mode, which can help you rule out problematic apps as the cause of your device problems.

Access Voicemail

Access voicemail, check voicemail messages, and view voicemail options.

Change or Reset Voicemail Password

Reset a forgotten password or change an existing voicemail password.

Set Up Voicemail

Set up voicemail.

Having device issues?

Fix common service and device problems.