Home phone upgrade to 4G not working, Calls not allowed on this line message

It doesn't sound like it's been activated. See if this link helps if not you'll probably need to work with tech support. 

When you say home phone upgrade are you talking about a wireless home phone and is the model number IFWA-40?  

Yes, it is a wireless home phone and the new base station is model number IFWA-40

Ok, I went to the link you provided and clicked on one of the sim links, it asked for my phone number and zip code. Then it came up with the correct information for the base station and the sim card. I confirmed that the information was correct. This worked and the phone is now working, but I have to wonder why the instructions do not include this step? I certainly appreciate your help with this issue. Thank you.

Glad it was an easy fix. Don't know why they don't supply the activation information with the unit, seems like that would be a no brainer. 

@evil_skippy Approximately what date did you obtain your IFWA-40?

AT&T notified me they stopped supplying this product on 12/7/2021 so they are refusing to upgrade my 3G wireless home phone and allow service continuity. Please advise whether yours was ordered before or after Dec 7.

original post was 2/7/22

I am in the same sinking boat as evil_skippy: I was sent the same model on Feb 28, 2022 and after is set it up I got the same message that the IFWA-40 won't work.

Read the topic. Evil-skippy got there's working by following the link that was provided. You got this message where?

I followed the link you listed, entered my number, zip and SIM information and once I clicked on continue, that's when I got the message stating that the IFWA-40 model will not work.