Come on man, that isn't how advertising works. Product promotion before launch is incredibly important. Why do you think Apple has an event to announce a phone and available date? So they get tons of free advertising from the media and so they get gigantic lines at their stores. If we all just wok up one Friday and Apple had a new phone for sale they would get none of that.
I've seen exactly zero commercials for these devices, but I don't see commercials as I'm a cord cutter. I did see some HTC One stuff while watching soccer, but that's about it.
You just made my point. Apple has an event to get press coverage. HTC had an event a few months back to get press coverage. Apple does not advertise the iPhone prior to the iPhone's release. They are not running ads weeks before the release.
Now, with the phone coming out Friday we all should see a ton of advertising very soon. If we don't you have a point but not advertising a product that cannot be purchased is a little silly and really not done that often.