I have this unlocked Samsung galaxy S2 skyrocket i727 ICS 4.0.4 Stock updated via Kies (baseband version I727UCLF6), It is rooted and have ClockworkMod TOUCH 5.5.0.4 on it too.
Then I put my T-Mobile SIM on it and i got 2G speed (edge)
So i done some searching and i found that i have to flash...