iOS 4.0.1 Signal Bars and Tape Reception Test
The other thing the tape simulates is how the iPhone 4’s antenna would behave with a thick 1-mil (25.4 µm) coating. To test, I cupped the phone just like I did to cause the 24 dBm drop before.…The takeaway is that the best coatings Apple could possibly apply would bring the drop down to 15 or 16 dB—in league with the Nexus One’s worst case drop, and almost in league with the iPhone 3GS worst case drop.
