Seems that users of Google Voice residing in the United States of America will not be able to take advantage of this service with a new iPhone.
The Google Voice service provides the user the ability to pass calls that are made to a central number and distribution of many mobile phones and land lines. Not working property pass calls, regularly iPhone4, as emphasized by many users that the installation is successful but the property are often correctly but other times do not work properly during the connection only and receive text messages and review missed calls responded to them was walking properly.
Has contacted affected by this problem to customer service at AT & T told them it was working to fix this flaw, the "Google" and "Apple" has not yet attached to this issue, which is exacerbated by the uncertainty and anxiety that plagues users.