I was recently given a used iPhone 3G as a gift, and I intend on using it as a iPod. I am told there are ways to do this, but I can not make sense of it. My phone is completely wiped with no sim card. I went to iTunes, but it won't let me activate it without a sim, which I don't have. Is there something I am missing here? Anything I can do to make its use basically an iPod?