Internet calling company Skype said Sunday that it has entered into a definitive agreement to acquire GroupMe, a startup that offers a free group text messaging and conference call service on mobile phones.

Skype did not disclose how much it is paying for GroupMe.

Set up in 2010, GroupMe offers its application on Apple’s iPhone, Research In Motion’s BlackBerry, and phones running the Android operating system. It also launched in July a version of its application for Microsoft’s Windows Phone 7. A short message service (SMS) version for users without smartphones is also available in the U.S.

More: http://www.macworld.com/article/161858/