I have recently received a free 3G MicroCell from AT&T. Once everything was connected and my iPhone 4 was setup on the MicroCell, I couldn't reproduce the left corner antenna issue. When I placed my finger over the two metal sides, the five bars stayed on screen without a single drop in signal. To test, I unplugged the MicroCell, placed a finger over the two metal antennas until all five bars dropped to zero. Then I powered up the MicroCell making sure not to remove my finger from the bottom left corner of the iPhone. Once the MicroCell's 3G status indicator light was on, all five bars filled up one by one all while my finger was still on the trouble area. Hopefully this information helps those who are constantly fighting the left corner antenna issue as I was. Unfortunately this only helps if you are within 5000 sq ft of your MicroCell. The good thing for me is that I usually talk on the iPhone while at home therefore this is a functional workaround. Lastly I'm wondering if this could be some of the reason why AT&T sent out free MicroCells? I'm curious to know anyone's thoughts?