I don't understand how this explains the people who claim the iPhone 4 has a higher drop-call rate than their 3GS. It also doesn't explain the video which feat

I don't understand how this explains the people who claim the iPhone 4 has a higher drop-call rate than their 3GS. It also doesn't explain the video which features the 3GS and 4 side-by-side, where they cannot get the 3GS to drop the call at all. Unless, of course, they are implying the software will drop the call itself if it thinks there is no signal? Is that something the software should really be doing?