Today i have sucessfully unlocked htc blackstone To unlock htc blackstone you have to do this
1: connect phone to pc port
2: fully sync and then scan in axe box program
3: then after scan click cid unlock
4:after cid unlock complete program will tell u ,but close program and open
again and re scan.
5: do sim unlock now after sim unlock complete close program and scan again
6: your phone is unlocked
Possible problem after unlock in some phones
Problem with colour on HTC HD blackstone
to solve this just update your rom thats all
hope this will help all