I'm about to buy a second hand HTC desire HD. I was wandering if i'll be able to use the website htc.sense.com. Furthermore, is the validation code only valid once? Does it come in the original box? should I demand the seller to guarantee that htcsense.com work on my phone? Will htcsense.com work anywhere in the world? And last but not least, iv'e heard that the website has a lot of faults and is not working properly. Is that true? What does HTC say about that? Thanks!