Before you can use Wi-Fi calling you'll need to register your 911 address at my.t-mobile.com first. If you skip this step, then you may get a "REG09" error.

Changing Your 911 Address via My T-Mobile:

1. Open your browser and log in to "My T-Mobile" on the carrier's homepage (click the link to access it)
2. Click "Your profile" in the navigation bar at the top
3. Under "Customer information" click "Edit"
4. Enter your home address and click "Save Changes". Usually it takes about an hour for the update to complete

Changing Your 911 Address via My T-Mobile Beta:

1. Follow the first two steps mentioned above
2. Next to "E911 Address" click the "Edit" button
3. Enter your address and click "Save"
4. Once the confirmation pop-up appears on the screen, click "OK"

Setting Up Your Device to use Wi-Fi or Mobile Networks:

1. While on the home screen, press the "Menu" key on your device
2. Select "Settings"
3. Tap "More settings"
4. Press "Wi-Fi Calling"
5. Tap "Connection preferences"
6. Select one of the options below:

• Wi-Fi Preferred: while connected to a Wi-Fi network, all calls will be made over Wi-Fi. If a connection is not available then calls will be made over the cellular network.
• Cellular Network Preferred: all the calls will be made via the cellular network. If there's no coverage or no network available, calls will be made over Wi-Fi
• Never use Cellular Network: With this option selected, all calls will be made over Wi-Fi network only. If there is no Wi-Fi network in range, you will not be able to make / receive phone calls

Enabling Wi-Fi and Connecting to a Network:

1. While on the home screen, press the "Menu" key on your device
2. Select "Settings"
3. Tap the "Wi-Fi" switch to bring it into the "On" position
4. Tap "Wi-Fi" (the text itself, not the switch)
5. If no network is being shown or if you're not able to find the desired one, tap the "Scan" button and review the list once the scanning process is completed
6. Tap the Wi-Fi network that you wish to connect to. If requested, type-in the network's password
   
   
   • Note: If required, tap "Show advanced options" and enter the IP and Proxy settings
   
   
7. Tap "Connect"

Enabling Wi-Fi Calling:

1. Make sure that Wi-Fi is enabled and that you are connected to a Wi-Fi network
2. While on the home screen, press the "Menu" button on your device
3. Select "Settings" > "More settings"
4. Tap the "Wi-Fi Calling" switch to bring it in the "On" position