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T-Mobile SIM Doesn’t Work on Unlocked iPhone 4 Running iOS 4.3.3

Hi, I have managed to jailbreak and unlock my iPhone 4 on iOS 4.3.3 using Ultrasn0w 1.2.3. But the problem is it seems like my unlocked iPhone doesn’t recognize my T-Mobile SIM card. I have already tried to use numerous T-Mobile SIM cards but still no luck! Any idea to get it working? Please help! Thanks in advance.

Asked by: Sylvia from South Bend, Indiana

Hello Sylvia, before we can proceed, you need to make sure that your baseband is Ultrasn0w compatible. This means that under your Settings>>General>>About, your Modem Firmware version must read as 01.59.00 & nothing other than that. On iOS 4.3.3, you would be able to achieve this only if you had preserved your BB for every restore that you may have performed on your device with a custom cooked IPSW using either Sn0wbreeze / Pwnage Tool.

If by any chance your not on 01.59.00, then the only way to currently unlock your device is by using a Gevey SIM.

Activate iPhone 4 on T-Mobile using SAM

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