"Everyone does. It's hardware based." Well, why can't I make it drop calls? Why can't any of my eight friends in Houston replicate it either? Weird. Maybe it's more prone to happen in certain areas of the country. I know 8 people with iPhone 4 in Houston, and I've asked all of them if they've had an issue with dropping calls while covering the left corner. NONE of them have. Not one....including me. I can make the bars decrease from full to maybe 3 or so, but I can literally cover the whole bottom left corner with my hand, and it doesn't drop calls.