1) Normal signal attenuation is when the signal is shielded by something (or someone). Most/all phones are prone to this.
2) Specific to Apple: 2 antennas on the outside with but a small strip separating them. Touch this with even mildly sweaty hands and you have a galvanic connection between the antennas which will immediately cause signal degradation/loss.
Apple is still trying their hand-waiving (if not outright lies) to make consumers believe that no. 2 does not exist and that iPhone4 only suffers from no. 1.
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