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Browse device topics
Learn how to access files downloaded from a web browser, email, and messages.
Discover how to use Google to back up contacts, photos, and files.
Get familiar with in-call options, including muting and speakerphone, as well as advanced call features, such as creating a conference call.
Learn how to set up AT&T Call Protect for an HD Voice-capable smartphone on your AT&T wireless account.
AT&T Video Call lets you make and receive HD Voice calls combined with real-time video.
Learn how to turn Bluetooth on or off, scan and connect to other Bluetooth devices, and unpair a connected device.
Learn how to set up your device as a personal hotspot and share your data connection with Wi-Fi-capable devices.
View cellular network signal, turn cellular data connection, international roaming, and mobile data connection on or off.
Set up your device for the first time or after a factory reset and use Setup & Transfer.
Learn how to use air gestures and motions as well as access additional motions and gestures.
Learn how to access keyboard settings, use Swype, auto-complete suggestions, emojis, speech-to-text, and one-handed operation.
Make changes to apps, widgets, folders, wallpapers, home screen panels, and screen grid.
View text and picture messages, calls, and voicemail messages in a single inbox. Send and receive messages from your tablet or computer.
Learn how to manage email settings such as sync frequency, server settings, signature, removing an email account, and more.
Manage messaging settings such as notification alerts, Advanced Messaging, message limits, restore default settings, and emergency/AMBER alert settings.
Create and respond to text (SMS), Advanced Messaging, or picture (MMS) messages, add, save, and view received attachments and more.
Listen to music and audio in immersive 3D sound that is balanced in a selected direction.
Learn how Google Assistant allows you to control your device and access voice control settings using voice commands.
View and pay your AT&T bills online, manage your account, reset passwords, or upgrade your AT&T services.
Look at photos, watch videos, listen to songs, and more in just a few taps.
Learn how to access and use Camera modes, effects, customization, and crop a photo.
Manage camera and video settings including picture size, timer, voice control, and flash.
Learn how to access the camera, take a picture, switch between front and rear facing camera, and more.
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.
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.
Accessibility features improve the usability of your device for users with impaired vision or hearing, cognitive difficulty, or reduced dexterity.
Learn how to access and adjust notification settings, turn notifications on or off, and more.
Learn how to update the software of the LG K40 (LMX420AS).
Learn how to troubleshoot apps by clearing the app cache, force stopping an app, checking for updates, removing an app, and reinstalling.