I now firmly believe the whole holding the phone thing is crap.
I have had 3 dropped calls tonight, of course I've only made 3....
2 of them the phone was on speaker sitting on my chest as I leaned back typing on the laptop.
Exactly how it is right now waiting for Apple.
The other time was walking around the house speaking with a customer. Had to call her back 3 times in the course of 10 minutes.
Every time it was silence then a drop.
While calling AT&T I get moments of silence, then it comes back.