http://www.anandtech.com/show/3794/the-iphone-4-review/2 Important parts: For this next part, it is important to understand that the closer to ZERO you get to, the higher your signal. Keep in mind that these are negative numbers. So: ***** (-99 to -51) (48) **** (-101 to -99) (2) *** (-103 to -101) (2) ** (-107 to -103) (4) * (-113 to -107) (6) He then goes on to test an ip4, ip3gs, and Nexus One, by cupping it tightly (like one would never actually do, but how people are doing in videos), holding it normally, and holding it in a case. What he finds is that holding the ip4 tightly means you are losing 24.6 dBm off your signal BUT the Nexus One isn't far behind in the same test, at 17.7 dBm. Holding the phone naturally you lose about 19.8 dBm of signal versus 10.7 on the Nexus One. Finally, with a standard case on it, the ip4 loses 7.2 dBm of signal versus 7.7 with the Nexus One. So, as you can see, the iPhone 4 definitely does lose a certain amount of signal, but it is basically under extreme conditions. Hopefully this post helps ease the concerns of those of you who have been on the fence after hearing of signal issues. If you live in an area with poor reception (4 bars or less on your current iPhone), and you plan on not using a case, you might want to rethink the iPhone 4 ... or wait for a possible fix. If that isn't your situation, you should be fine. The reception issue is way blown out of proportion and should not affect 85-90% of users.