Phone Sony Xperia X8 Network Unlock

Hi,
I've googeled several forums and articles about free solutions to network unlock Xperia Smartphones, all I could get is bootloader unlock!
Now my phone is successfully bootloader unlocked, thank's to flash tool and s1tool, My question is :
"IS THERE ANY FREE WAY TO UNLOCK SONY XPERIA X8 USING ONLY USB CABLE? I MEAN WITHOUT DONGLES OR BOX OR EVEN BUYING CREDITS FROM WEBSITES?"
I could unlock All Samsung Galaxy smartphones with only root permissions, busybox and few light Apk's , is it the same with Xperia X8 or should I buy a network unlock?? I'm ready to do all the necessary manipulations if prompted..
Thanks in advance!