You can also use root explorer to find the database settings.db change its permissions to all allowed then use the SQLlite app to edit the entitlement_check from a 1 to a 0
works on 230 and 232
after that I recommend changing the default IP third and last octec ex 192.168.22.1 to 192.168.44.2 (just something different) and I would recommend changing the channel from 6 to something else, reason being that typically wireless routers come defaulted to 6 and using 1,2 10 or 11 anything other than 6 has less clutter on the channel. You can get diminished signal range when your fighting all your neighbors. Just like the old days with CB get on another channel and there's less issues with signal.
using mobile hotspot (unless they changed it) is not AD HOC but more like a true wireless router. Ad Hoc will work if your using a laptop, desktop etc but many tablets out there and other phones will not connect to an Ad Hoc connection. (i.e. wifes original droid and htc thunderbolt would share internet to laptop but eepad did not work at all, mobile hotspot works on eepad.... )
not sure about foxfi but many wifi sharing apps are only Ad Hoc