I'm not having a problem where I live in Stockton, California. But I think with the addition of 1.5 million 3G iPads in the last two months... and the addition of 2 million iPhone4s, you may be on to something, especially in urban areas with lots of devices.
It's not signal strength to individual devices, its crowded cell towers handling too many signals, dropping connections as they switch around from computer to computer and tower to tower.
Anybody but Apple’s fault.
Who will it be next?
Could this wrong formula that “stunned” them have been created and planted in the phones during update 2.0.2 as a “solution” to this problem ?
http://www.roughlydrafted.com/2008/08/28/the-inside-deets-on-iphone-202-and-dropped-calls/
If so, you are looking at massive increases in dropped calls as this “fix” hits the streets.