The biggest problem with telephones that still persists even today, is that you can only hang up on somebody once. Anybody who can solve that problem is bound to revolutionize communication as we know it.
Or the phone company doesn't immediately disconnect the caller, so you could pick the phone back up and slam it down again, at least a couple of more times.
Imagine that there was a phone receiver that delivered a zero to nominally painful electric current based on how abruptly the audio from the other speaker cut off... All sorts of reasons that this isn't doable, but the psychological satisfaction of knowing that spam caller just got zapped...
When they bring a new Razr out you can snap it shut like a high powered executive looking out over Manhattan's skyline and maybe that will be cool enough.
