Antenna is not the only problem with iPhone4 its USB cable can burn hand.
A member of the internal AT & T has sent the pictures on the iPhone charger port 4 for the first fire site Boygeniusreport. This model gives a home network using this device to get changed , but AT & T employee said the store does not stock them .
The iPhone 4 in the burn status page below , while the USB cable deformation , melting . When things happen , the owners of this model and tried to unplug hand burns .
A member of the AT & T said the iPhone fire port 4 on no fault of the user. This is considered the first iPhone was burned four ports , but not Apple’s first product to explode. Before that , many people use the iPod Touch , Nano and iPhone 3G complained to their mobile explosion and fire .
(source: Boygeniusreport, denthan)

