Just open the app and it will display a list of nearby Foursquare locations, filtered to only include those that have a WiFi password in their tips, and be online.
My note before using the 4sqwifi app is that using a hotspot without the owner’s permission is a little rude, but the information is already shared on Foursquare and this app is simply making it easier to access.
You can get the app directly iTunes link by clicking Here.
[Via]