Originally Posted by Ghand0ur
Yes, it can be done fully using the computer. Search for unlocking the bootloader guide. Better done on YouTube. Best of luck mate
EDIT: Seems like its an O2 CID issue.
Same issue : http://forum.xda-developers.com/show...6#post46021716
I think you should go to O2 not HTC and try to get a fix.
Sent from my HTC One x+ using XDA developers app
Thanks for the advice.
I am not on contract with O2 , I have a pay-as-you-go sim with giffgaff. So either the previous owner got the phone from O2 or its because giffgaff use O2 satellite service. I don't know much about these things, so don't know what would decide the O2 logo being on boot.