After digging around a bit, I've managed to get my mother in law's phone hotspotting again. I'm standing on the shoulders of Giants here, so please don't credit me with anything. I just wanted to 1) archive this in case I need to repeat it at some point 2) help others out who may need some access, but don't want to double pay for it.
Her phone is rooted with tdhite's skyhigh kernel installed and majisk module, but I was still getting the "not subscribed" error when I tried to launch a hotspot. I grabbed a root explorer and navigated to system>etc> where I found a file named old-apns-conf.xml
I opened that file and added ",dun" (no quotes) after every instance of mms (I think there were 3 or 4). I saved the file and she was in business. This method has survived a reboot, so that's nice too.
I don't know if it's relevant it not, but we have a legacy family unlimited plan.
Her phone is rooted with tdhite's skyhigh kernel installed and majisk module, but I was still getting the "not subscribed" error when I tried to launch a hotspot. I grabbed a root explorer and navigated to system>etc> where I found a file named old-apns-conf.xml
I opened that file and added ",dun" (no quotes) after every instance of mms (I think there were 3 or 4). I saved the file and she was in business. This method has survived a reboot, so that's nice too.
I don't know if it's relevant it not, but we have a legacy family unlimited plan.