Tested by iLounge (where do these pictures), this case named Griffin Clearboost would actually improve somewhat the GSM reception when it is already correct. In other words, instead of displaying two bars, your iPhone will show maybe four.

Unfortunately, it seems that Clearboost is useless, or nearly so, in areas where reception is already very low. The device is therefore of interest whether you are looking for a quality of optimal network in town or in areas already well covered.

Of course, it is also possible to buy it for its qualities of protective case than for outside antenna system, but we prefer no doubt in this case turn to a simple case, no protuberance will not deform. Allow about $ 35, excluding postage, ten dollars more than a simple case of the same brand.