Already raised the anger of some developers and customers, the decision to refuse an application for Google Voice Apple Store in the App also attracted attention in the FCC.

According to a Dow Jones Newswire report, on Friday afternoon, FCC sent letters to Apple, AT & T, and Google. The federal investigation into Apple asked why Google Voice application was dismissed from his store of applications for iPhone and IPod Touch, and why it was deleted by third-party applications built on the Google app, which were previously approved. The Federal Commission also asks whether the AT & T was allowed to weigh in on the application before it was rejected, and seeks to describe an application of its creator, Google, according to the report. There was no complaint filed with the FCC on the Apple-out of Google voice, so it is not a formal investigation.

Apple did not immediately return a request for comment.

Google Voice is a free application that allows users to designate a single number to ring at home, at work, as well as mobile phones, as well as receive voice mail, text transcripts. Google Voice was described by some as “an end to prospects around the wireless carriers because it allows for free text and low-cost international calling, but you still use their minutes for AT & T phone plan.

The letters, apparently part of a broader look at the exclusivity contracts between manufacturers and wireless telephone carriers. AT & T, for example, is the exclusive carrier for iPhone in the United States

Following the announcement by Google, that his application was rejected by Apple earlier this week, some developers, customers and even the well-known blogger says Apple solution will lead them to stop using their iPhones, or to stop development for the platform.