Device help
Get step-by-step help and info for your device.
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Get directions and navigation using AT&T Navigator.
Browse the web, manage browser tabs, and bookmarks.
Access browser settings to clear history, set homepage, adjust text size, manage pop-up, change the default browser, and restore default settings.
Download apps, games, movies, music, books, magazine, newspapers and more.
Remove an icon from your home screen and delete apps from your device.
How to view, switch between, and close running applications.
Backup & Restore with a Computer
Backup and restore your device with a computer.
Backup & Restore with Memory Card
Backup contacts, photos, and files to increase device memory or transfer to another device.
Tips and tricks to extend your battery performance.
Tips on charging your battery.
Block or unblock calls from your device.
Show or hide your caller ID when making calls.
Manage call forwarding from your device.
Add another person to your call, merge calls, place someone on hold and more.
Add, view, delete, and customize contacts by adding a picture or ringtone.
Learn what features are available while on an active call.
Place, receive, and reject a call.
Make or receive a video call.
Use speed dial and manage speed dial contacts.
Turn Airplane mode on and off.
Turn Bluetooth on or off, scan and connect to other Bluetooth devices, and unpair a connected device.
Connect your device to the AT&T MicroCell.
Set up your device as a mobile hotspot and share your data connection with Wi-Fi-capable devices.
Use NFC to share content such as photos and contacts between compatible devices.
View cellular network signal, turn international roaming or your mobile data connection on or off.
Connect your device to a Wi-Fi network.
Check notifications and alerts, change settings, and more.
Activate New AT&T Prepaid® Service
Learn how to activate new AT&T Prepaid service and plan.
Determine your device's SIM card type, operating frequencies, physical characteristics, storage, and more.
Add apps, shortcuts, & widgets to your home screen
Learn How to Clean Your Device
Get tips on the best way to keep your device clean.
Set up your device for the first time or after having done a factory reset.
Control your device by making specific movements with your hand.
Cut and paste, use speech-to-text, and access keyboard settings.
Learn and Customize the Home Screen
Add shortcuts and widgets, access the notification panel, changing wallpaper, and more.
Change your AT&T PREPAID plan, check your balance, add money to your account and more.
Sign in using your Microsoft account to access Xbox LIVE, Windows Phone Store, and more.
Install and remove the SIM and battery.
Turn your device on and off.
Perform a text and voice search on your device and how to adjust search settings.
Block messages from your device.
Manage email settings such as sync frequency, server settings, signature, deleting an email account, and more.
Change text (SMS), picture (MMS), emergency, and amber alert settings.
Add and download email attachments, respond to an email and more.
Create and respond to text (SMS) or picture (MMS) messages, add, save, and view received attachments and more.
Add your Exchange email account to sync email, contacts, calendar, and notes to your device.
Add your personal email account to sync email, contacts, calendar, and notes to your device.
Activate New AT&T Prepaid® Service
Learn how to activate new AT&T Prepaid service and plan.
Project photos, videos, and media on your device to another device (TV, tablet, computer, etc.).
Access the calendar and manage events.
How to set up and use Cortana, a personal assistant that provides help whenever you need it.
Manage camera and video settings including flash, timer, voice control, recording mode, storage location, and more.
Play music, turn the music player off.
Take screenshots, edit a picture or video, use the front and rear camera, and switch between camera and video modes.
Transfer Media to & From a Computer
Transfer files to or from your device and a computer.
Access, view, and share your photos and videos.
Set up your device so you can remotely locate and control.
Lock the device screen, set and change security lock, and locate device.
Turn on features such as TalkBack, Hearing aid mode, and more.
Set the date and time.
Change the display time out, brightness and orientation.
Change volume settings, ringtones, and notification alerts.
Check the available device storage.
View the device IMEI, phone, SIM (ICCID) and serial number.
Software update for the Microsoft Lumia 640
Learn how to update the software of the Microsoft Lumia 640.
Determine your current device software version and check for updates.
Access Usage Manager to view data usage, set data limits, and see the apps using the most data.
Perform a soft, factory, and alternate master reset of the device.
Check your voicemail messages.
Change or Reset Voicemail Password
Reset a forgotten password or change an existing voicemail password.
Manage voicemail settings and security
Learn how to manage your voicemail, including recording a personal greeting and changing your password.
Set up voicemail on your device.
