The iPhone has always had a notoriously high call drop rate, especially around the New York area, to the point that an Apple customer went into their store to see if something was wrong. The customer sent in their findings to Gizmodo, which are rather alarming for users in general.
The customer, hereby referred to by his name, Manoj, checked with AT&T to ensure things were as they should be in New York, before taking it into the Apple Store. A Genius at said store performed a quick stat dump, which revealed that the iPhone had a 22% call drop rate... alarmingly high, yes, but that's not the worst part. The Genius at the store revealed that Manoj's iPhone was actually one of the lucky ones, as the 'normal' drop rate for the device in New York is around about 30%.
Unfortunately, there's nothing that can be done about it at the moment, besides having AT&T improve their service. Manoj's iPhone is in perfect working condition, which is rather upsetting, to say the least. The Genius wrote that "the phone is fully functional, and the problem is consistent with the service provided by AT&T." A picture of the returned results has been included below, so you can have a read for yourself.
(Image courtesy of Gizmodo.)