Well, Apple has just figured out what is wrong technically in the signal reception problem that many of their precious customers have been complaining! The simple solution is the way you hold the phone. The location of the antenna in the bottom left-hand corner that is being hidden by physical skin contact causes signal degradation.

All you have to do is hold the phone in another way or get a case to cover it up! Problem Solved! However, that leads to another question: why Apple is not changing the design, when they can recommend to their customers for buying a new case made for this purpose?

Thanks: Engadget