Hi kenreaves,Ultrasn0w can not unlock iPhone 4S according to my knowledge.
There is no inlocking tool available to unlock 4S so fAr.
You can unlock only iPhone 4 and predecessors with ultrasn0w.
as i said. ultrasn0w can not unlock iphone 4S no matter which firmware you have... so its pointless to downgrade your iOS ... forget it.Hi kenreaves,
Thanks for reply, if i downgrade my firmware in 5.0.1 than its possible to unlock sim? My phone is iphone 4s firmware 5.1.1 and baseband 04.12.01. if i downgraded to 5.0.1 baseband will change or not? please help me out.
thanks to advance.