Foxfi and PDAnet stopped working. Is it Samsung, or ATT?

Thanks; I'll try that. My version is 2.13.1, and the WiFi Mode addon is v3011, as shown at the top of the screen, when I load the app.

OK, I just checked, and there is no later versions than the one I have. I also downloaded 3 other wifi hotspot apps, and get the same AT&T message that I don't have hotspot capability, and to contact AT&T customer service.

Looks like they are blocking me from using my paid-for data plan on anything but the phone screen. :(