It has been less than one month since Palringo added its IM application to the iPhone App Store and we already have the major revision promised when it was released on July 29. The most notable addition of course, is Push-to-Talk (PTT) support. PTT, or vocal IM as they often call it in this case, is the feature that sets Palringo apart from competitors on various other platforms and now the great functionality is available to iPhone users as well. So how does it work? Just like standard PTT services, simply select a contact from your contact list and hold a [virtual] button while speaking. Finish talking, release the button and your audio recording is quickly delivered to the recipient. Incoming PTT messages can be played automatically or manually depending on your settings and they will play right from within the app. Of course Palringo also supports messaging to a variety of other IM platforms such as GTalk, Yahoo and AIM and they aren’t left out when it comes to PTT. The catch of course is that these IM services don’t support PTT so any vocal messages, just like picture messages, will be delivered as a link to the file hosted on Palringo servers. The recipient can then easily click the link and view your image file or play the PTT message right from within any standard browser. Of course the addition of PTT support doesn’t change the fact that the app is free and since all iPhones are sold with unlimited data, you’ve now got unlimited PTT as well – to any handset running Palringo on any network! Take that, carriers.