his video shows how to unlock Xperia X8 (E15i), Xperia mini (E10i), Xperia mini pro (U20), Walkman W8 (E16,E16i) and DoCoMo SO-01B by USB cable. Unlocking removes "SIM network unlock PIN" even if you phone is permanently blocked and it can't accept the unlock code anymore!
www.fastgsm.com
