I'm selling my old phone on EBay right now. It's a Sanyo 8300 (I think?) that I had when I was with Sprint. Someone sent me a message on there saying they worked for Sprint and would like to buy my phone but wanted proof it was clear to activate. They requested my ESN/DEC number or something. If I gave them that number, can anything bad come of that? I wrote back and told her I didn't know what all could be done if someone had that number so I wouldn't be giving that to her, but I told her if she was a Sprint customer care rep. that should could look up my old account and I gave her my cell number.