We know that prototype iPhone 4 units were disguised to look like older generation units using some clever cases. Now the NYT is speculating that this clever iPhone 4 testing disguise may have actually prevented Apple from noticing the odd antenna performance when the phone is held directly.
https://gizmodo.com/how-apple-conceals-prototype-iphones-5522315
The theory sounds reasonable enough because cases like the one used prevent individuals from actually coming into direct contact with the iPhone 4 antenna points and in turn would prevent some of the recently reported reception issues. [NYT]
http://gizmodo.com/5571171/iphone-4-loses-reception-when-you-hold-it-by-the-antenna-band
