I am getting the Desire Z from Canada because of the HTC Sense UI feature. I was wondering how the Sense.com work in terms of finding my lost phone? I read it needs wifi and GPS, but on the road if I don't have wifi or data plan would I still be able to find the phone (probably a stupid question)? Lastly, I am buying the phone from someone on Craigslist, the person said he hasn't registered the phone on HTC Sense.com. I was wondering what if the person had would I still be able to use Sense.com if I bought the phone off of him?