Foursquare 4.0 version has been unveiled by Foursquare of its iPhone app live. The latest iOS 5 function known as Foursquare Radar is included in this app. Users can utilize the region monitoring feature of iOS 5 with this new app. It gives the user notifications of locations that are kept in the lists. It acts somewhat as reminders.

Foursquare Radar sends notification to your iPhone, if more than three friends check in at some place. To benefit from this interesting feature, you should choose Radar. Currently, it is not available on any other platforms, but it is getting developed for other operating systems.

To run this app, you should get your Iphone upgraded to iOS 5. Foursquare 4.0 app is the very first app to benefit from iOS 5.