Can i unlock my jailbroken iphone 4 ios 6 baseband 4.12.02 using cydia?

Please! ANSWER SOMEONE! I just jailbroke my iPhone 4 it is on ios 6 (6.0.1) and baseband 4.12.02 and i want to unlock it so i can use a T Mobile sim card is there ANYWAY! To do so? Like can I use ultrasnow or sam? ANY THAT ARE COMPATIBLE WITH MY BASEBAND?

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You can't unlock your iPhone through Cydia because the baseband is not compatible with any versions. You can purchase a factory unlock on eBay for about $2.50 and this will unlock your iPhone forever… Just go on eBay and search for "iPhone 4 AT&T Factory Unlock Service" and you will find many choices.

If you have any questions, feel free to ask me at
http://www.iHelpCorner.com
http://www.YouTube.com/ian559fresno

No, New iOS versions not supported to unlock with any third party software.

I think this will help you
http://unlockappledevices.com