Starting off with a complaint in the MacRumors forums and soliciting other user feedback from there, Gizmodo is compiling a hefty list of people whose brand new iPhone 4 would drop from full bars to next to none -- when they held it by the stainless steel antenna band.
Is it shorting something when both parts are connected by a conductive human hand? Is it a pressure issue? Just some units or all of them?
UPDATE: Engadget says it might happen most frequently when its held in the left hand and skin touches the area where the BT/Wi-Fi/GPS antenna meets the GSM/UMTS antenna.
We don't know yet but if you're having the same problem let us know!