Ah, like so. I had it wrong anyway.
Thanks Amarok, I downloaded the app you requested and tried to follow the guide but I don’t get FDD LTE on the bm818-tools app. I get None. Sometimes the app cannot read the firmware but if I reboot and run the app again it will find the FW version. It’s the exact FW version in the screenshot. I did the socat command as well with the AT+BMRAT command and also get None instead of FDD LTE. My APN is fast.t-mobile.com with no username / password set. Network is set to Automatic, I can select t-mobile for network and hit “set” but when I come back to it it’s back to automatic, doesn’t seem to save. mobile settings shows:
Modem Status
Carrier: (blank)
Network Type: unknown but sometimes switches to LTE and shows.
Network Status: Not registered.
The only difference I see is that FDD LTE never shows up. Any idea why?
I would email support@puri.sm and ask them. They might have you download and install the most recent modem firmware. The one that I and apparently you have is an older version that works for some, but not for others, I believe.
My experience getting 4G calling on T-Mobile to work is documented here:
I had to update the firmware in my modem and emailing Purism support was what got me the answers I needed.