The low signal problem with iPhone 4 has been solved by using brand new Bumper Cases, which approximately cost USD175 Million for Apple to replace all the circulated iPhone 4 device in the global market. There are six available colours you could choose from, including white, black, blue, green, orange and pink.
If you live in UK, you could head over the link here for more information, while for those reside in United States, you could get more info here. For the rest of the world, you could contact your local iPhone 4 dealer of purchase point for more info for the bumper cases.
No confirmation if Apple will distribute the bumper cases for free, or for fraction of fee for the bumper cases’ cost. But it is likely to be a better idea compare to recall all the iPhone 4 worldwide, which estimated should cost USD1.5 billion.