It seems as if the problems that have plagued the GSM version of Apple iPhone 4 have come back to haunt the Verizon iPhone 4 handset despite apparent modifications to the original design.
Charles Starrett of iLounge (opens in new tab) conducted a number of performance tests on the iPhone 4 and found out that the phone still suffered from signal attenuation issues like the first iPhone 4.
The issue seems to affect both Wi-Fi signal (when held snugly with both hands as mentioned by iLounge) and the mobile phone signal strength (using the death grip). iLounge stuck to the same benchmark variables for the CDMA iPhone 4 and the GSM version and the issues appeared at the same geographic location as for the iPhone 4, indoors.
Using a protective case seems to fix the antenna issue as well and signal attenuation may be inconspicuous in areas where signal is stronger. Expect more customer complaints to emerge as the first Verizon iPhone 4 are delivered as from the 10th of February.