Wi-Fi calling setup on BYOP AT&T Android

[wdeacond]

I recently switched from ATT. I had my phone unlocked and installed a TMobile sim as I was told I could use wifi calling on that. I live in a rural area where there is little to non signal from anyone. I used a ATT microcell at home, or wifi calling. I set wifi calling up in my Straight talk account, but when I try to enable wifi calling on my phone, I get the same page as I did with ATT. When I try to enable, I get a message that I need to use an address, which I entered in my st ACCOUNT FOR WIFI CALLING. when I press the "Get Started button on my phone, I get a circling progressing message, then I get a message Wi-Fi calling, Network Connection error. Please try again, which keeps repeating. Any help is welcome.

[ST - Larry]

Hi wdeacond. I'm Straight Talk Larry. I'm sorry that you are having some problems. We will check if the phone is properly provisioned in the system, and help you with the troubleshooting. To further assist you, please check your forum inbox for a message. Click on "New Messages" beside User Control Panel to view your forum inbox. You may also text the key word HELP to 611611 to view our self-service menu with a list of help key words with valuable information. Thank you.