Rewind the clock to June 7th 2010. Steve’s on stage at the WWDC in San Francisco. He’s introducing the iPhone 4 and proudly shows off the new external antenna design. Antennae actually, there are two of them wrapped around the side. Steve touts the very Apple-like combination of function (better reception), and form (elegant design).
And now we enter another part of the multiverse. Jobs stops…and after a slightly pregnant pause, continues: The improved reception comes at a price. If you hold the iPhone like this, if your hand or finger bridges the lower-left gap between the two antennae, the signal strength indicator will go down by two or even three bars. He proceeds to demo the phenomenon. Indeed, within ten seconds of putting the heel of his left thumb on the gap, the iPhone loses two bars. Just to make sure, he repeats the experiment with his index finger, all the while making a live call to show how the connection isn’t killed.
It’s not a bug, it’s a feature! It’s a trade-off: Better reception in the vast majority of cases; some degradation, easily remedied, in a smaller set of circumstances.