since when has 100% been considered a "very small proportion"?
Every single person can duplicate this, it is a design flaw.
Blocking the antenna on any phone will mess with reception. What planet are you from?
I haven't had any issues with my iPhone 4 and I've had it since launch day and I travel a lot. I hate going to Salem though, because there is nearly no reception in the hilly part of West Salem. But my reception is no worse than it was with any other phone there.