Ultrasn0w

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The first iPhone 3G unlock. Released on 01/01/09. [1]

A demo (of a console-only version of the app though) can be seen at http://qik.com/video/729275.

Credit

geohot (injection exploit), MuscleNerd, and The dev team (payload).

Exploit

Relies on an unsigned code exploit.

The actual unlock works by a daemon patching the baseband's RAM on-the-fly, overriding the carrier lock code. It is not permanent because of the signature checks - the bootloader has to pass the sigchecks and the baseband has to pass them too, so any change to the baseband/bootloader cannot be made.

The exploit itself is a buffer overflow in the at+stkprof cmd that devteam used to patch out the carrier checks in RAM.

Source Code

The source code for yellowsn0w is now live [2]

Compatibility

yellowsn0w doesn't work with some carriers or stops working after a while.

See Also

External links

Country Provider SIM/USIM Calls? SMS? GPRS/EDGE? UMTS/HSDPA? Comments
Bermuda Mobility SIM No No No No Works for about ten minutes then "Sim Failure" occurs and yellowsn0w stops working.
Germany O2 SIM Yes Yes Icon shown but not tested Icon shown but not tested --