iPhone 4 Signal Strength Indicator Issue Alleviated by Use of Bumper or Case
Quite a few users have reported experiencing an issue with cellular signals appearing to degrade when holding the lower left portion of their iPhone 4s. While not all users have been able to reproduce the problem, it does seem to be fairly widesprea...
http://www.macrumors.com/2010/06/24/iphone-4-signal-strength-indicator-issue-alleviated-by-use-of-bumper-or-case/
