Well..., I’ve never heard of this being a problem “overall” — but as anyone knows... there is no cell service that covers *all areas* — so in any service, *someone* is going to be on the fringe of the service....
Thus, you can always find someone on the fringe... but the real question here is if this is happening “overall”... and from what I’ve seen and heard and read about — no it isn’t...
I’m in a large metro area. My own experience is that the iPhone is great for everything but the actual phone.