I had very few drop calls with my iPhone going back to the first month the iPhone was released. this week however, I am dropping probably 80% of my calls, maybe even more than that. I cannot see any other possibility than the new G4 phones are bringing their network to it’s knees.
Could be that it’s summer. In my area in the past in the summer I always dropped calls (it’s a tourist area) and they didn’t have the tower capacity to handle the summer load.