So, I snagged a Sensation on the cheap off a friend of mine, and now trying to SIM Unlock it. However, when trying to follow the HTCDev utility to unlock the phone, I get security failure and asked to reboot (completely unable to select an option from the bootloaded menu to select fastboot), when I try Unlock through Simons Wildfire Tool (works with the Sensation apparently), I get nothing but a picture of the phone and a red Warning triangle. So far I'm unable to unlock this to SIM unlock it, and it's completely useless to me on T-mobile. I'm not arsed about the warranty, or about it having to be rooted, but it needs to be rooted before I can unlock the SIM.
I don't want to help you root or unroot your Sensation