Works perfectly on the AT&T i727 on JB 4.1.2
I've had ICS since it came out, but I got tired of Jelly Bean "Coming soon to the Samsung Galaxy S II Skyrocket", and Kies telling me that "Your firmware is not upgradeable via Kies". so I flashed a deodexed JB 4.1.2, (UCLK4) obtained from instructions at techethon.com/how-to-update-android-4-1-2-in-galaxy-s2-skyrocket-att-sgh-i727/
After restoring all the Apps with Titanium, I found that WiFi Tether was broken. Tore my hair out for hours trying to find the solution.
Found this thread. Installed WifiTether_TrevE_Mod_11_22_2012.