Attempted to replicate by 3 methods:
1- Held the phone with one hand covering the bottom WWAN antenna completely with a tight grip and thumb on the side of the device. extending up about 3/4 of the way on the left side where the upper WWAN antenna resides.
2. Held the phone in the palm on the top covering the WWAN antenna and the wifi/bt antennas with the thumb resting across the top of the device (over the power button)
3. held the phone with both hands in opposing directions, completely covering the entire rear panel of the phone and effectively blocking all the antennas. - No way to be on a phone call like this!
I experienced minimal capacitive detuning/attenuation with a sample rate of 1 second on 1x (CDMA)
Unfortunately here there is no LTE yet, only WiMax