No one debates that blocking cell phone antennas can have an effect on their signal.
The differences with the iPhone 4 are that it can be so dramatic (right down to dropping a call or freezing data transfer), and it happens if you simply place a single finger in a very common position.
....The differences with the iPhone 4 are that it can be so dramatic (right down to dropping a call or freezing data transfer), and it happens if you simply place a single finger in a very common position.