While some folks got pretty excited about the prospect of running VoIP applications such as Skype over devices running Apple’s OS 4.0, word that Skype now intends to charge for 3G-based Skype, which is available via Skype 2.0, is putting an end to some of those celebrations, according to a recent article. However, just when such fees will go into effect remains to be seen. Meanwhie, word is that Wi-Fi calls are likely to remain free of charge.

Apple in April previewed iPhone OS 4 software.

"iPhone OS 4 is the fourth major release of the world's most advanced mobile operating system," said Steve Jobs, Apple's CEO. "We're delivering over 100 new features, including multitasking, folders, a unified inbox, deeper Enterprise support, and an iPhone version of our iBooks reader and online iBookstore." iPhone OS 4's services include background audio, so apps like Pandora can play music in the background, and VoIP, so VoIP apps can receive a VoIP call even when the iPhone is asleep or the user is running other apps.

According to Apple, iPhone OS 4 also delivers the best mail experience on a mobile phone with its new Unified Inbox, allowing users to see messages from all their email accounts displayed together in a single inbox. With just a few taps, users can quickly switch between inboxes to see messages from any single account. In addition, users can now thread their messages by conversation, making it easier to stay on top of email discussions, as well as open email attachments with compatible apps from the App Store.

By Paula Bernier.