Re: My new Samsung Galaxy Light says "error Missing 911 Address" how do I fix that?

To add an e911 address, follow these steps:

1. Open the T-Mobile My Account application.
2. Tap Account info.
3. Tap Settings.
4. Tap 911 Address.
5. Enter your home address.
6. Tap Continue.
   Note: Allow up to one hour for the e911 address to update.

source: e911 troubleshooting for Wi-Fi Calling