No VoIP apps for iPhone just yet.

Last month, the phone giant AT&T Inc. announced that they would begin allowing iPhone owners to use VoIP calling services on its wireless network. The move came two months after the Federal Communications Commission sent letters to AT&T, Apple and Google Inc. asking why the Google Voice messaging and calling application had not been approved for use on the iPhone.

Everybody applauded this decision, but more than one month has passed by and applications such as Skype, Nimbuzz, Truphone or Fring still don’t work on the iPhone outside of Wi-Fi spots.

Those connections generally have limited mobility and therefore present less of a competitive threat to AT&T’s core wireless calling business. Nevertheless it is seemingly Apple the one who is preventing this to happen. In fact, an AT&A spokesman said: “any questions about why VoIP isn’t 3G enabled should go to Apple.”

Meanwhile Apple spokeswoman Natalie Kerris said in an email that they are still working on the update to their development agreements in order to get VoIP apps on the App Store as soon as possible.