Have you tried to drop signal by touching the death spot on the bottom left? Some reports are coming in that some canadian phones aren't doing it at all... There are reports of two Canadian iphone 4s on the same network in the same location where one phone was dropping signal and the other wasn't. I know this isn't conclusive to anything... but I'm just curious to see if recently new iPhone 4 owners are able to reproduce the signal drop. If not, maybe it's time to finally jump in. Do a quick test, let us know.