I’ve been very lightly testing the FP4 on AT&T in NYC & Fort Lauderdale. Calls & texts have worked ok in my apartments, I haven’t taken it out and done any real testing that way.
I have been able to browse the web while on a call with wifi turned off.
AT&T shut down their 3G network yesterday, but I can still make calls while browsing the web w/o wifi.
I originally activated the FP4 with the SIM from my Samsung Galaxy S10 on the same plan.
I called them from the FP4 just now, both phones show as using the same Galaxy S10 IMEI on their system.
When they tried to update the FP4 line with its own IMEI, they got an error.
So, for now it is working on AT&T. I’ll keep testing it and see if they eventually cut it off.
Sorry to hear about T-Mobile not working, that was going to be my next step if AT&T cuts it off.