Early iPhone 4 adopters have been reporting problems with mysterious dropped carrier signals.
It turns out that Apple's clever idea to turn the outer steel rim of the iPhone 4's admittedly beautiful case into the handset's antennas may not have been such a great idea after all.
It turns out that effectively shorting out two of the case components with your sweaty mitts drastically reduces the strength of the carrier signal as our exclusive video proves.
Apple has responded, saying: "Gripping any mobile phone will result in some attenuation of its antenna performance, with certain places being worse than others depending on the placement of the antennas. This is a fact of life for every wireless phone. If you ever experience this on your iPhone 4, avoid gripping it in the lower left corner in a way that covers both sides of the black strip in the metal band, or simply use one of many available cases."
So there you have it. Get a case... or get a (different) grip.