From VoIP.ms Wiki
Bria for Android
Once you launch the VoIP app you will need to select the 'More' option at the top right of the screen, and then select "Settings" and then "Account Settings".
This value is used to set outgoing Caller ID. You can leave it blank.
- Username (Your Account or Sub Account number)
Please enter the username provided to you upon setup (e.g. 123456 or 123456_XXX).
Enter the password provided when you signup.
Enter houston.voip.ms (Voip.ms Servers)
Please enter the username for your account or sub account.