Foursquare for iOS
Foursquare is optimized to work best on iOS7, on iPhone 4 and higher.
How to enable location services on iOS
Foursquare relies on using your location to show you great places around you. In order to do this, we ask for permission to use your location services.
To grant or deny Foursquare access to your location services, start by going to your Settings and selecting Privacy.
Then select Location Services at the top and scroll to Foursquare. Changing the switch to green will grant Foursquare permission to use your location.