Help with jailbreaking and Cydia for iPhones, iPads, and iPod touches.

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How to fix some mysterious problems.

How do I sim unlock my IPHONE 4 4.2.1??... I need it to work on T-mobile.

Or is there no way i can do it??...

asked 07 Feb '11, 21:34

hinangel's gravatar image


Did you preserve your baseband when you upgraded to 4.2.1? If so you can unlock with ultrasn0w. If're in a bit of a pickle :(


answered 07 Feb '11, 21:43

orion023's gravatar image


i bought it last 2 weeks, and i know it is on 4.2.1 already. so i guess i have to wait for the sim unlock....


answered 07 Feb '11, 21:51

hinangel's gravatar image


Yup. For updates on how the unlock for 03.10.01 is going (the version likely on your phone), you can follow @sherif_hashim on Twitter.

(07 Feb '11, 22:06) gomanski gomanski's gravatar image

What baseband version do you have?

You can find your baseband version by going to Settings > General > About and looking for "Modem Firmware"

If it is anything other than 01.59.00, you cannot currently unlock.


answered 07 Feb '11, 21:42

gomanski's gravatar image


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Asked: 07 Feb '11, 21:34

Seen: 638 times

Last updated: 07 Feb '11, 21:51

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