Anandtech has posted another thorough review and this time they give a detailed analysis of the iPhone 4.  There’s a lot of great information in the article and it’s worth reading, but I’ll list some of the notable highlights below.

• Squeezing the iPhone 4 can result in a 24 dBm loss in signal strength.  Holding it naturally results in a 19.8 dBm loss.  This drastic signal drop could result in the bar strength indicator going from 5 bars to 5 bars or 5 bars to zero bars.  The reason for this seemingly contradictory behavior is because dropping from -51 dBm to -75 dBm is still within the 5-bar range, but dropping from -90 dBm to – 114 dBm would mean a drop from 5 bars to zero bars.  This demonstrates how blunt and inaccurate the bar indicators are.
• Holding the phone with bare hands actually improved the Wi-Fi signal substantially.
• iPhone 4 has superior radio sensitivity to the iPhone 3GS.  It can be quite functional at a faint -113 dBm when the iPhone 3GS would bomb.
• AnandTech showed that the Speedtest.net app is limited to ~ 8 Mbps.  I ran some tests with Nick Brown and we’re measuring 19 to 20 Mbps peaks (sustained for 10 seconds) with 802.11g and 802.11n mode using the built-in iPhone 4 web browser and a local IIS 7 web server on Nick’s home network.  We’ll be publishing the screen shots and results later tonight.
• AT&T’s 3G network has more than doubled in performance over last year.  Looks like the $36 billion that AT&T spent in 2009 and 2010 is being put to good use.
• iPhone 4 “retina display” appears to be superior to the other Android phones with 800×480 resolution display.  However, the pixel wars on smartphones have just started and Android 3 devices will have 1280×760 resolution displays for screens larger than 4 inches.