I've been having battery problems with my iPhone 4, where about every 4 hours the battery will drop about 8% while in standby, with no push or email checking etc... turned on. I phoned Applecare and they are sending me a new iPhone 4 under the advanced replacement service. When I asked the man I was talking to if the iPhone would be new or a refurb, he told me that many replacement 3GSs were refurbs, but since the iPhone 4 is so new, it would be new. It's not that I don't trust Apple, but I want to make sure that I'm still getting the new phone I paid for. Is there any way to tell if the phone I get is a refurb? Serial numbers or anything? Thanks 