I have Iphone4 iOS 4.3 tethered jailbreak and I'm using turbo sim for simple mobile, I wanna go to upgrade to 4.3.3 untethered I wanna know first if it safe and possible, can anybody guide me to make it happen .thx..
Yes. Download the 4.3.3 firmware or make a custom 4.3.3 firmware using pwnage tool (Mac) or sn0wbreeze (win) if you make the custom firmware you can choose so your jailbroken if not use redsn0w rc15 and jailbreak
I didn't know there is turbo sim out there that can unlock it if that is what he is using.
Usually apple will patch it with new updates to block the turbo sim from working.