I think that it was just a short edit of the show and not that August only dialed three numbers.
Just an edit? Oh, “but what’s the fun in that?“
I named it the OZ Phone because of its unusual look and the possibilities that idea opens. It’s obviously a prop made to look that way, otherwise, any old phone would have done the job. Why so much detail on THAT phone? – And yes, time constraints could be the reason for editing the rotary dialing action to a couple of spins of the dial but I like to think the limited numbers August dialed is suspect – it may be nothing but it’s more fun to believe otherwise.
So, sure, August could have been talking to Henry about Operation Cobra because, that’s the next scene we see but again, I choose to believe otherwise because it opens up possibilities like, August dialed someone else’s room at the Inn or perhaps, someone on a closed circuit system. In other words, he spoke to an accomplice or authority we do not yet know his connection to. “Are you there?…Good…This is taking too long. We need to accelerate the plan.” doesn’t sound like how he might have phrased it to Henry. Whereas, “…accelerate Operation Cobra” does, as it is more kid-like and supports that particular storyline. August’s urgent delivery of that line, seemed more like an adult conversation and in reference to a plan bigger and more complex than Henry’s clubhouse jargon.
I think we have August manipulating Henry in order to move along a plan that is a little darker than what a child might imagine. I believe, a major twister is about to blow through Storybrooke and it’s not at all like anything as simple as a Fairy Tale ending.