How to unlock iphone 4 ios 5.1.1 bb firmware 4.12.01?

Just bought an iphone 4 ios 5.1.1 bb 4.12.01 couldnt unlock it as it was already on ios 5.1.1 n didn't have the lockdown file saved with redsnow! Please help me to make it unlock n useful for any carrier service.

Unfortunately you can't unlock your iPhone as of yet because of the baseband.

To unlock the I-phone 4 i would suggest the remote unlock service. It's best than all other unlocking service. Visit the site http://www.prounlocking.com/apple-iphone-4/rs8wp9/ get the remote unlock service and unlock it easily. After Unlock it use with any GSM Network sim card. In this method you just Update the I-phone software to latest Version and you need to use i-tunes software to unlock it.

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