Didn't see a thread like this, so I'm posting it. Sorry if someone beat me to the punch and this is the umptenth thread. Anyways, on launch day I was able to crash signal via the deathgrip method on ALL of Apple's iPhone 4 demos. Today I returned to the store out of curiosity and attemted to crash the very same phones I played with on launch day. Guess what? I couldn't get a single iPhone 4 to crash signal using the deathgrip method. They didn't even lose a single bar of strength. I checked the firmware in the phones and they were all running 4.0 (I did not, however, check serial numbers). Clearly Apple has replaced the original iPhone 4 demos with new ones... and these new ones aren't crashing signal. I looked at the antennas and they are identical in texture and color to mine (which i got on launch day).