Try as we might, Computerworld editors were unable to reveal anything like the "death grip" vulnerability on the Verizon iPhone that we are easily able to demonstrate on the AT&T iPhone. Charles Starrett of iLounge published a convincing with demonstrating a reduction in reception strength apparently corresponding to grip position on the Verizon iPhone 4.

In addition to our own series of tests for this problem, we attempted to duplicate Starrett's results and came up empty. No matter what we did, the Verizon-based smartphone showed five bars and throughput was undiminished.

Speaking of throughput, we used the iPhone app to measure the performance of the iPhone 4 on both AT&T and Verizon networks. We ran the test several times on the two phones simultaneously. Both phones were showing five bars.